# OpcClient.ReadNode Method

> Reference: Reads the Value attribute of the node specified by nodeId.

<dl class="api-definition">
<dt>Type</dt>
<dd><a href="./">OpcClient</a></dd>
<dt>Namespace</dt>
<dd><a href="../namespaces/opc.uafx.client">Opc.UaFx.Client</a></dd>
<dt>Assembly</dt>
<dd>Opc.UaFx.Advanced.dll</dd>
<dt>Package</dt>
<dd>Opc.UaFx.Advanced v2.59.0</dd>
<dt>Members</dt>
<dd><a href="./members">OpcClient Members</a></dd>
<dt>Also in</dt>
<dd>Opc.UaFx.Client</dd>
</dl>

<span class="api-meta">21 overloads</span>

| Overload | Description |
|---|---|
| [ReadNode(OpcNodeId)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcclient/readnode#readnode-opc-uafx-opcnodeid) | Reads the [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute of the node specified by `nodeId`. |
| [ReadNode(OpcNodeId, OpcAttribute)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcclient/readnode#readnode-opc-uafx-opcnodeid-opc-uafx-opcattribute) | Reads the `attribute` of the node specified by `nodeId`. |
| [ReadNode(string)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcclient/readnode#readnode-system-string) | Reads the [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute of the node specified by `nodeId`. |
| [ReadNode(string, OpcAttribute)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcclient/readnode#readnode-system-string-opc-uafx-opcattribute) | Reads the `attribute` of the node specified by `nodeId`. |
| [ReadNode(int)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcclient/readnode#readnode-system-int32) | Reads the [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute of the node specified by `nodeId`. |
| [ReadNode(int, OpcAttribute)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcclient/readnode#readnode-system-int32-opc-uafx-opcattribute) | Reads the `attribute` of the node specified by `nodeId`. |
| [ReadNode(string, int)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcclient/readnode#readnode-system-string-system-int32) | Reads the [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute of the node specified by `nodeId` and `namespaceIndex`. |
| [ReadNode(string, int, OpcAttribute)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcclient/readnode#readnode-system-string-system-int32-opc-uafx-opcattribute) | Reads the `attribute` of the node specified by `nodeId` and `namespaceIndex`. |
| [ReadNode(int, int)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcclient/readnode#readnode-system-int32-system-int32) | Reads the [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute of the node specified by `nodeId` and `namespaceIndex`. |
| [ReadNode(int, int, OpcAttribute)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcclient/readnode#readnode-system-int32-system-int32-opc-uafx-opcattribute) | Reads the `attribute` of the node specified by `nodeId` and `namespaceIndex`. |
| [ReadNode(OpcReadNode)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcclient/readnode#readnode-opc-uafx-opcreadnode) | Reads the value of an attribute of a node using the specified `command`. |
| [ReadNode(OpcNodeId, OpcRange)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcclient/readnode#readnode-opc-uafx-opcnodeid-opc-uafx-opcrange)<span class="api-meta">since v2.24</span> | Reads the `range` from the [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute of the node specified by `nodeId`. |
| [ReadNode(OpcNodeId, OpcAttribute, OpcRange)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcclient/readnode#readnode-opc-uafx-opcnodeid-opc-uafx-opcattribute-opc-uafx-opcrange)<span class="api-meta">since v2.24</span> | Reads the `range` from the `attribute` of the node specified by `nodeId`. |
| [ReadNode(string, OpcRange)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcclient/readnode#readnode-system-string-opc-uafx-opcrange)<span class="api-meta">since v2.24</span> | Reads the `range` from the [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute of the node specified by `nodeId`. |
| [ReadNode(string, OpcAttribute, OpcRange)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcclient/readnode#readnode-system-string-opc-uafx-opcattribute-opc-uafx-opcrange)<span class="api-meta">since v2.24</span> | Reads the `range` from the `attribute` of the node specified by `nodeId`. |
| [ReadNode(int, OpcRange)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcclient/readnode#readnode-system-int32-opc-uafx-opcrange)<span class="api-meta">since v2.24</span> | Reads the `range` from the [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute of the node specified by `nodeId`. |
| [ReadNode(int, OpcAttribute, OpcRange)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcclient/readnode#readnode-system-int32-opc-uafx-opcattribute-opc-uafx-opcrange)<span class="api-meta">since v2.24</span> | Reads the `range` from the `attribute` of the node specified by `nodeId`. |
| [ReadNode(string, int, OpcRange)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcclient/readnode#readnode-system-string-system-int32-opc-uafx-opcrange)<span class="api-meta">since v2.24</span> | Reads the `range` from the [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute of the node specified by `nodeId` and `namespaceIndex`. |
| [ReadNode(string, int, OpcAttribute, OpcRange)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcclient/readnode#readnode-system-string-system-int32-opc-uafx-opcattribute-opc-uafx-opcrange)<span class="api-meta">since v2.24</span> | Reads the `range` from the `attribute` of the node specified by `nodeId` and `namespaceIndex`. |
| [ReadNode(int, int, OpcRange)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcclient/readnode#readnode-system-int32-system-int32-opc-uafx-opcrange)<span class="api-meta">since v2.24</span> | Reads the `range` from the [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute of the node specified by `nodeId` and `namespaceIndex`. |
| [ReadNode(int, int, OpcAttribute, OpcRange)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcclient/readnode#readnode-system-int32-system-int32-opc-uafx-opcattribute-opc-uafx-opcrange)<span class="api-meta">since v2.24</span> | Reads the `range` from the `attribute` of the node specified by `nodeId` and `namespaceIndex`. |

**Known results:** [BadNodeIdInvalid](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcstatuscode/#badnodeidinvalid), [BadNodeIdUnknown](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcstatuscode/#badnodeidunknown), [BadAttributeInvalid](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcstatuscode/#badattributeinvalid), [BadIndexRangeInvalid](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcstatuscode/#badindexrangeinvalid), [BadIndexRangeNoData](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcstatuscode/#badindexrangenodata), [BadDataEncodingInvalid](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcstatuscode/#baddataencodinginvalid), [BadDataEncodingUnsupported](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcstatuscode/#baddataencodingunsupported), [BadNotReadable](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcstatuscode/#badnotreadable), [BadUserAccessDenied](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcstatuscode/#baduseraccessdenied)

**Exceptions (all overloads)**

| Exception | Condition |
|---|---|
| [ObjectDisposedException](https://learn.microsoft.com/dotnet/api/system.objectdisposedexception) | The object has been disposed of. |
| [OpcException](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcexception/) | The service execution failed upon different circumstances; for more details see exception details. The following issues can lead to that exception: [BadNothingToDo](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcstatuscode/#badnothingtodo), [BadTooManyOperations](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcstatuscode/#badtoomanyoperations), [BadMaxAgeInvalid](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcstatuscode/#badmaxageinvalid) and [BadTimestampsToReturnInvalid](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcstatuscode/#badtimestampstoreturninvalid). |

## ReadNode(OpcNodeId)

Reads the [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute of the node specified by `nodeId`.

<div class="api-signature" data-lang="csharp">

```csharp
public OpcValue ReadNode(OpcNodeId nodeId)
```

</div>

<div class="api-signature" data-lang="vbnet">

```vbnet
Public Function ReadNode(nodeId As OpcNodeId) As OpcValue
```

</div>

**Parameters**

| Name | Type | Description |
|---|---|---|
| `nodeId` | [OpcNodeId](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeid/) | The [OpcNodeId](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeid/) of the node to read. |

**Returns**

[OpcValue](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcvalue/)

An instance of the [OpcValue](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcvalue/) class which stores the value requested.

**Exceptions**

| Exception | Condition |
|---|---|
| [ArgumentException](https://learn.microsoft.com/dotnet/api/system.argumentexception) | The `nodeId` indicates to be a null-node-id (see [IsNull](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeid/members#isnull)). |
| [ArgumentNullException](https://learn.microsoft.com/dotnet/api/system.argumentnullexception) | The `nodeId` is a null reference (Nothing in Visual Basic). |
| [InvalidOperationException](https://learn.microsoft.com/dotnet/api/system.invalidoperationexception) | The read service is currently not supported, especially using the arguments specified. |

## ReadNode(OpcNodeId, OpcAttribute)

Reads the `attribute` of the node specified by `nodeId`.

<div class="api-signature" data-lang="csharp">

```csharp
public OpcValue ReadNode(OpcNodeId nodeId, OpcAttribute attribute)
```

</div>

<div class="api-signature" data-lang="vbnet">

```vbnet
Public Function ReadNode(
    nodeId As OpcNodeId,
    attribute As OpcAttribute) As OpcValue
```

</div>

**Parameters**

| Name | Type | Description |
|---|---|---|
| `nodeId` | [OpcNodeId](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeid/) | The [OpcNodeId](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeid/) of the node to read. |
| `attribute` | [OpcAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/) | One of the members defined by the [OpcAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/) enumeration that defines which node attribute is to be used by the service. |

**Returns**

[OpcValue](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcvalue/)

An instance of the [OpcValue](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcvalue/) class which stores the value requested.

**Exceptions**

| Exception | Condition |
|---|---|
| [ArgumentException](https://learn.microsoft.com/dotnet/api/system.argumentexception) | The `nodeId` indicates to be a null-node-id (see [IsNull](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeid/members#isnull)). |
| [ArgumentNullException](https://learn.microsoft.com/dotnet/api/system.argumentnullexception) | The `nodeId` is a null reference (Nothing in Visual Basic). |
| [InvalidOperationException](https://learn.microsoft.com/dotnet/api/system.invalidoperationexception) | The read service is currently not supported, especially using the arguments specified. |

## ReadNode(string)

Reads the [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute of the node specified by `nodeId`.

<div class="api-signature" data-lang="csharp">

```csharp
public OpcValue ReadNode(string nodeId)
```

</div>

<div class="api-signature" data-lang="vbnet">

```vbnet
Public Function ReadNode(nodeId As String) As OpcValue
```

</div>

**Parameters**

| Name | Type | Description |
|---|---|---|
| `nodeId` | [String](https://learn.microsoft.com/dotnet/api/system.string) | The textual node identifier of the node to read. |

**Returns**

[OpcValue](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcvalue/)

An instance of the [OpcValue](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcvalue/) class which stores the value requested.

**Exceptions**

| Exception | Condition |
|---|---|
| [ArgumentException](https://learn.microsoft.com/dotnet/api/system.argumentexception) | The `nodeId` is an empty string. |
| [ArgumentNullException](https://learn.microsoft.com/dotnet/api/system.argumentnullexception) | The `nodeId` is a null reference (Nothing in Visual Basic). |
| [InvalidOperationException](https://learn.microsoft.com/dotnet/api/system.invalidoperationexception) | The read service is currently not supported, especially using the arguments specified. |

## ReadNode(string, OpcAttribute)

Reads the `attribute` of the node specified by `nodeId`.

<div class="api-signature" data-lang="csharp">

```csharp
public OpcValue ReadNode(string nodeId, OpcAttribute attribute)
```

</div>

<div class="api-signature" data-lang="vbnet">

```vbnet
Public Function ReadNode(
    nodeId As String,
    attribute As OpcAttribute) As OpcValue
```

</div>

**Parameters**

| Name | Type | Description |
|---|---|---|
| `nodeId` | [String](https://learn.microsoft.com/dotnet/api/system.string) | The textual node identifier of the node to read. |
| `attribute` | [OpcAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/) | One of the members defined by the [OpcAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/) enumeration that defines which node attribute is to be used by the service. |

**Returns**

[OpcValue](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcvalue/)

An instance of the [OpcValue](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcvalue/) class which stores the value requested.

**Exceptions**

| Exception | Condition |
|---|---|
| [ArgumentException](https://learn.microsoft.com/dotnet/api/system.argumentexception) | The `nodeId` is an empty string. |
| [ArgumentNullException](https://learn.microsoft.com/dotnet/api/system.argumentnullexception) | The `nodeId` is a null reference (Nothing in Visual Basic). |
| [InvalidOperationException](https://learn.microsoft.com/dotnet/api/system.invalidoperationexception) | The read service is currently not supported, especially using the arguments specified. |

## ReadNode(int)

Reads the [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute of the node specified by `nodeId`.

<div class="api-signature" data-lang="csharp">

```csharp
public OpcValue ReadNode(int nodeId)
```

</div>

<div class="api-signature" data-lang="vbnet">

```vbnet
Public Function ReadNode(nodeId As Integer) As OpcValue
```

</div>

**Parameters**

| Name | Type | Description |
|---|---|---|
| `nodeId` | [Int32](https://learn.microsoft.com/dotnet/api/system.int32) | The numeric node identifier of the node to read. |

**Returns**

[OpcValue](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcvalue/)

An instance of the [OpcValue](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcvalue/) class which stores the value requested.

**Exceptions**

| Exception | Condition |
|---|---|
| [ArgumentException](https://learn.microsoft.com/dotnet/api/system.argumentexception) | The `nodeId` is equals zero. |
| [InvalidOperationException](https://learn.microsoft.com/dotnet/api/system.invalidoperationexception) | The read service is currently not supported, especially using the arguments specified. |

## ReadNode(int, OpcAttribute)

Reads the `attribute` of the node specified by `nodeId`.

<div class="api-signature" data-lang="csharp">

```csharp
public OpcValue ReadNode(int nodeId, OpcAttribute attribute)
```

</div>

<div class="api-signature" data-lang="vbnet">

```vbnet
Public Function ReadNode(
    nodeId As Integer,
    attribute As OpcAttribute) As OpcValue
```

</div>

**Parameters**

| Name | Type | Description |
|---|---|---|
| `nodeId` | [Int32](https://learn.microsoft.com/dotnet/api/system.int32) | The numeric node identifier of the node to read. |
| `attribute` | [OpcAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/) | One of the members defined by the [OpcAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/) enumeration that defines which node attribute is to be used by the service. |

**Returns**

[OpcValue](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcvalue/)

An instance of the [OpcValue](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcvalue/) class which stores the value requested.

**Exceptions**

| Exception | Condition |
|---|---|
| [ArgumentException](https://learn.microsoft.com/dotnet/api/system.argumentexception) | The `nodeId` is equals zero. |
| [InvalidOperationException](https://learn.microsoft.com/dotnet/api/system.invalidoperationexception) | The read service is currently not supported, especially using the arguments specified. |

## ReadNode(string, int)

Reads the [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute of the node specified by `nodeId` and `namespaceIndex`.

<div class="api-signature" data-lang="csharp">

```csharp
public OpcValue ReadNode(string nodeId, int namespaceIndex)
```

</div>

<div class="api-signature" data-lang="vbnet">

```vbnet
Public Function ReadNode(
    nodeId As String,
    namespaceIndex As Integer) As OpcValue
```

</div>

**Parameters**

| Name | Type | Description |
|---|---|---|
| `nodeId` | [String](https://learn.microsoft.com/dotnet/api/system.string) | The textual node identifier of the node to read. |
| `namespaceIndex` | [Int32](https://learn.microsoft.com/dotnet/api/system.int32) | The index of the namespace within that the node with the `nodeId` specified can be located. |

**Returns**

[OpcValue](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcvalue/)

An instance of the [OpcValue](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcvalue/) class which stores the value requested.

**Exceptions**

| Exception | Condition |
|---|---|
| [ArgumentException](https://learn.microsoft.com/dotnet/api/system.argumentexception) | The `nodeId` is an empty string. |
| [ArgumentNullException](https://learn.microsoft.com/dotnet/api/system.argumentnullexception) | The `nodeId` is a null reference (Nothing in Visual Basic). |
| [InvalidOperationException](https://learn.microsoft.com/dotnet/api/system.invalidoperationexception) | The read service is currently not supported, especially using the arguments specified. |

## ReadNode(string, int, OpcAttribute)

Reads the `attribute` of the node specified by `nodeId` and `namespaceIndex`.

<div class="api-signature" data-lang="csharp">

```csharp
public OpcValue ReadNode(
    string nodeId,
    int namespaceIndex,
    OpcAttribute attribute)
```

</div>

<div class="api-signature" data-lang="vbnet">

```vbnet
Public Function ReadNode(
    nodeId As String,
    namespaceIndex As Integer,
    attribute As OpcAttribute) As OpcValue
```

</div>

**Parameters**

| Name | Type | Description |
|---|---|---|
| `nodeId` | [String](https://learn.microsoft.com/dotnet/api/system.string) | The textual node identifier of the node to read. |
| `namespaceIndex` | [Int32](https://learn.microsoft.com/dotnet/api/system.int32) | The index of the namespace within that the node with the `nodeId` specified can be located. |
| `attribute` | [OpcAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/) | One of the members defined by the [OpcAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/) enumeration that defines which node attribute is to be used by the service. |

**Returns**

[OpcValue](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcvalue/)

An instance of the [OpcValue](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcvalue/) class which stores the value requested.

**Exceptions**

| Exception | Condition |
|---|---|
| [ArgumentException](https://learn.microsoft.com/dotnet/api/system.argumentexception) | The `nodeId` is an empty string. |
| [ArgumentNullException](https://learn.microsoft.com/dotnet/api/system.argumentnullexception) | The `nodeId` is a null reference (Nothing in Visual Basic). |
| [InvalidOperationException](https://learn.microsoft.com/dotnet/api/system.invalidoperationexception) | The read service is currently not supported, especially using the arguments specified. |

## ReadNode(int, int)

Reads the [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute of the node specified by `nodeId` and `namespaceIndex`.

<div class="api-signature" data-lang="csharp">

```csharp
public OpcValue ReadNode(int nodeId, int namespaceIndex)
```

</div>

<div class="api-signature" data-lang="vbnet">

```vbnet
Public Function ReadNode(
    nodeId As Integer,
    namespaceIndex As Integer) As OpcValue
```

</div>

**Parameters**

| Name | Type | Description |
|---|---|---|
| `nodeId` | [Int32](https://learn.microsoft.com/dotnet/api/system.int32) | The numeric node identifier of the node to read. |
| `namespaceIndex` | [Int32](https://learn.microsoft.com/dotnet/api/system.int32) | The index of the namespace within that the node with the `nodeId` specified can be located. |

**Returns**

[OpcValue](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcvalue/)

An instance of the [OpcValue](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcvalue/) class which stores the value requested.

**Exceptions**

| Exception | Condition |
|---|---|
| [ArgumentException](https://learn.microsoft.com/dotnet/api/system.argumentexception) | The `nodeId` is an empty string. |
| [ArgumentNullException](https://learn.microsoft.com/dotnet/api/system.argumentnullexception) | The `nodeId` is a null reference (Nothing in Visual Basic). |
| [InvalidOperationException](https://learn.microsoft.com/dotnet/api/system.invalidoperationexception) | The read service is currently not supported, especially using the arguments specified. |

## ReadNode(int, int, OpcAttribute)

Reads the `attribute` of the node specified by `nodeId` and `namespaceIndex`.

<div class="api-signature" data-lang="csharp">

```csharp
public OpcValue ReadNode(int nodeId, int namespaceIndex, OpcAttribute attribute)
```

</div>

<div class="api-signature" data-lang="vbnet">

```vbnet
Public Function ReadNode(
    nodeId As Integer,
    namespaceIndex As Integer,
    attribute As OpcAttribute) As OpcValue
```

</div>

**Parameters**

| Name | Type | Description |
|---|---|---|
| `nodeId` | [Int32](https://learn.microsoft.com/dotnet/api/system.int32) | The numeric node identifier of the node to read. |
| `namespaceIndex` | [Int32](https://learn.microsoft.com/dotnet/api/system.int32) | The index of the namespace within that the node with the `nodeId` specified can be located. |
| `attribute` | [OpcAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/) | One of the members defined by the [OpcAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/) enumeration that defines which node attribute is to be used by the service. |

**Returns**

[OpcValue](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcvalue/)

An instance of the [OpcValue](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcvalue/) class which stores the value requested.

**Exceptions**

| Exception | Condition |
|---|---|
| [ArgumentException](https://learn.microsoft.com/dotnet/api/system.argumentexception) | The `nodeId` is equals zero. |
| [ArgumentNullException](https://learn.microsoft.com/dotnet/api/system.argumentnullexception) | The `nodeId` is a null reference (Nothing in Visual Basic). |
| [InvalidOperationException](https://learn.microsoft.com/dotnet/api/system.invalidoperationexception) | The read service is currently not supported, especially using the arguments specified. |

## ReadNode(OpcReadNode)

Reads the value of an attribute of a node using the specified `command`.

<div class="api-signature" data-lang="csharp">

```csharp
public OpcValue ReadNode(OpcReadNode command)
```

</div>

<div class="api-signature" data-lang="vbnet">

```vbnet
Public Function ReadNode(command As OpcReadNode) As OpcValue
```

</div>

**Parameters**

| Name | Type | Description |
|---|---|---|
| `command` | [OpcReadNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcreadnode/) | The [OpcReadNode](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcreadnode/) instance to process. |

**Returns**

[OpcValue](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcvalue/)

An instance of the [OpcValue](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcvalue/) class which stores the value requested by the `command`.

**Exceptions**

| Exception | Condition |
|---|---|
| [ArgumentNullException](https://learn.microsoft.com/dotnet/api/system.argumentnullexception) | The `command` is a null reference (Nothing in Visual Basic). |
| [InvalidOperationException](https://learn.microsoft.com/dotnet/api/system.invalidoperationexception) | The read service is currently not supported, especially using the `command` specified. |

## ReadNode(OpcNodeId, OpcRange)

<span class="api-meta">since v2.24</span>

Reads the `range` from the [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute of the node specified by `nodeId`.

<div class="api-signature" data-lang="csharp">

```csharp
public OpcValue ReadNode(OpcNodeId nodeId, OpcRange range)
```

</div>

<div class="api-signature" data-lang="vbnet">

```vbnet
Public Function ReadNode(nodeId As OpcNodeId, range As OpcRange) As OpcValue
```

</div>

**Parameters**

| Name | Type | Description |
|---|---|---|
| `nodeId` | [OpcNodeId](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeid/) | The [OpcNodeId](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeid/) of the node to read. |
| `range` | [OpcRange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcrange/) | The [OpcRange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcrange/) to use to identify the single element or range of elements to read. |

**Returns**

[OpcValue](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcvalue/)

An instance of the [OpcValue](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcvalue/) class which stores the value requested.

**Exceptions**

| Exception | Condition |
|---|---|
| [ArgumentException](https://learn.microsoft.com/dotnet/api/system.argumentexception) | The `nodeId` indicates to be a null-node-id (see [IsNull](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeid/members#isnull)). |
| [ArgumentNullException](https://learn.microsoft.com/dotnet/api/system.argumentnullexception) | The `nodeId` is a null reference (Nothing in Visual Basic). |
| [InvalidOperationException](https://learn.microsoft.com/dotnet/api/system.invalidoperationexception) | The read service is currently not supported, especially using the arguments specified. |

## ReadNode(OpcNodeId, OpcAttribute, OpcRange)

<span class="api-meta">since v2.24</span>

Reads the `range` from the `attribute` of the node specified by `nodeId`.

<div class="api-signature" data-lang="csharp">

```csharp
public OpcValue ReadNode(
    OpcNodeId nodeId,
    OpcAttribute attribute,
    OpcRange range)
```

</div>

<div class="api-signature" data-lang="vbnet">

```vbnet
Public Function ReadNode(
    nodeId As OpcNodeId,
    attribute As OpcAttribute,
    range As OpcRange) As OpcValue
```

</div>

**Parameters**

| Name | Type | Description |
|---|---|---|
| `nodeId` | [OpcNodeId](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeid/) | The [OpcNodeId](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeid/) of the node to read. |
| `attribute` | [OpcAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/) | One of the members defined by the [OpcAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/) enumeration that defines which node attribute is to be used by the service. |
| `range` | [OpcRange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcrange/) | The [OpcRange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcrange/) to use to identify the single element or range of elements to read. |

**Returns**

[OpcValue](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcvalue/)

An instance of the [OpcValue](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcvalue/) class which stores the value requested.

**Exceptions**

| Exception | Condition |
|---|---|
| [ArgumentException](https://learn.microsoft.com/dotnet/api/system.argumentexception) | The `nodeId` indicates to be a null-node-id (see [IsNull](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeid/members#isnull)). |
| [ArgumentNullException](https://learn.microsoft.com/dotnet/api/system.argumentnullexception) | The `nodeId` is a null reference (Nothing in Visual Basic). |
| [InvalidOperationException](https://learn.microsoft.com/dotnet/api/system.invalidoperationexception) | The read service is currently not supported, especially using the arguments specified. |

## ReadNode(string, OpcRange)

<span class="api-meta">since v2.24</span>

Reads the `range` from the [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute of the node specified by `nodeId`.

<div class="api-signature" data-lang="csharp">

```csharp
public OpcValue ReadNode(string nodeId, OpcRange range)
```

</div>

<div class="api-signature" data-lang="vbnet">

```vbnet
Public Function ReadNode(nodeId As String, range As OpcRange) As OpcValue
```

</div>

**Parameters**

| Name | Type | Description |
|---|---|---|
| `nodeId` | [String](https://learn.microsoft.com/dotnet/api/system.string) | The textual node identifier of the node to read. |
| `range` | [OpcRange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcrange/) | The [OpcRange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcrange/) to use to identify the single element or range of elements to read. |

**Returns**

[OpcValue](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcvalue/)

An instance of the [OpcValue](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcvalue/) class which stores the value requested.

**Exceptions**

| Exception | Condition |
|---|---|
| [ArgumentException](https://learn.microsoft.com/dotnet/api/system.argumentexception) | The `nodeId` is an empty string. |
| [ArgumentNullException](https://learn.microsoft.com/dotnet/api/system.argumentnullexception) | The `nodeId` is a null reference (Nothing in Visual Basic). |
| [InvalidOperationException](https://learn.microsoft.com/dotnet/api/system.invalidoperationexception) | The read service is currently not supported, especially using the arguments specified. |

## ReadNode(string, OpcAttribute, OpcRange)

<span class="api-meta">since v2.24</span>

Reads the `range` from the `attribute` of the node specified by `nodeId`.

<div class="api-signature" data-lang="csharp">

```csharp
public OpcValue ReadNode(string nodeId, OpcAttribute attribute, OpcRange range)
```

</div>

<div class="api-signature" data-lang="vbnet">

```vbnet
Public Function ReadNode(
    nodeId As String,
    attribute As OpcAttribute,
    range As OpcRange) As OpcValue
```

</div>

**Parameters**

| Name | Type | Description |
|---|---|---|
| `nodeId` | [String](https://learn.microsoft.com/dotnet/api/system.string) | The textual node identifier of the node to read. |
| `attribute` | [OpcAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/) | One of the members defined by the [OpcAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/) enumeration that defines which node attribute is to be used by the service. |
| `range` | [OpcRange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcrange/) | The [OpcRange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcrange/) to use to identify the single element or range of elements to read. |

**Returns**

[OpcValue](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcvalue/)

An instance of the [OpcValue](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcvalue/) class which stores the value requested.

**Exceptions**

| Exception | Condition |
|---|---|
| [ArgumentException](https://learn.microsoft.com/dotnet/api/system.argumentexception) | The `nodeId` is an empty string. |
| [ArgumentNullException](https://learn.microsoft.com/dotnet/api/system.argumentnullexception) | The `nodeId` is a null reference (Nothing in Visual Basic). |
| [InvalidOperationException](https://learn.microsoft.com/dotnet/api/system.invalidoperationexception) | The read service is currently not supported, especially using the arguments specified. |

## ReadNode(int, OpcRange)

<span class="api-meta">since v2.24</span>

Reads the `range` from the [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute of the node specified by `nodeId`.

<div class="api-signature" data-lang="csharp">

```csharp
public OpcValue ReadNode(int nodeId, OpcRange range)
```

</div>

<div class="api-signature" data-lang="vbnet">

```vbnet
Public Function ReadNode(nodeId As Integer, range As OpcRange) As OpcValue
```

</div>

**Parameters**

| Name | Type | Description |
|---|---|---|
| `nodeId` | [Int32](https://learn.microsoft.com/dotnet/api/system.int32) | The numeric node identifier of the node to read. |
| `range` | [OpcRange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcrange/) | The [OpcRange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcrange/) to use to identify the single element or range of elements to read. |

**Returns**

[OpcValue](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcvalue/)

An instance of the [OpcValue](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcvalue/) class which stores the value requested.

**Exceptions**

| Exception | Condition |
|---|---|
| [ArgumentException](https://learn.microsoft.com/dotnet/api/system.argumentexception) | The `nodeId` is equals zero. |
| [InvalidOperationException](https://learn.microsoft.com/dotnet/api/system.invalidoperationexception) | The read service is currently not supported, especially using the arguments specified. |

## ReadNode(int, OpcAttribute, OpcRange)

<span class="api-meta">since v2.24</span>

Reads the `range` from the `attribute` of the node specified by `nodeId`.

<div class="api-signature" data-lang="csharp">

```csharp
public OpcValue ReadNode(int nodeId, OpcAttribute attribute, OpcRange range)
```

</div>

<div class="api-signature" data-lang="vbnet">

```vbnet
Public Function ReadNode(
    nodeId As Integer,
    attribute As OpcAttribute,
    range As OpcRange) As OpcValue
```

</div>

**Parameters**

| Name | Type | Description |
|---|---|---|
| `nodeId` | [Int32](https://learn.microsoft.com/dotnet/api/system.int32) | The numeric node identifier of the node to read. |
| `attribute` | [OpcAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/) | One of the members defined by the [OpcAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/) enumeration that defines which node attribute is to be used by the service. |
| `range` | [OpcRange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcrange/) | The [OpcRange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcrange/) to use to identify the single element or range of elements to read. |

**Returns**

[OpcValue](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcvalue/)

An instance of the [OpcValue](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcvalue/) class which stores the value requested.

**Exceptions**

| Exception | Condition |
|---|---|
| [ArgumentException](https://learn.microsoft.com/dotnet/api/system.argumentexception) | The `nodeId` is equals zero. |
| [InvalidOperationException](https://learn.microsoft.com/dotnet/api/system.invalidoperationexception) | The read service is currently not supported, especially using the arguments specified. |

## ReadNode(string, int, OpcRange)

<span class="api-meta">since v2.24</span>

Reads the `range` from the [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute of the node specified by `nodeId` and `namespaceIndex`.

<div class="api-signature" data-lang="csharp">

```csharp
public OpcValue ReadNode(string nodeId, int namespaceIndex, OpcRange range)
```

</div>

<div class="api-signature" data-lang="vbnet">

```vbnet
Public Function ReadNode(
    nodeId As String,
    namespaceIndex As Integer,
    range As OpcRange) As OpcValue
```

</div>

**Parameters**

| Name | Type | Description |
|---|---|---|
| `nodeId` | [String](https://learn.microsoft.com/dotnet/api/system.string) | The textual node identifier of the node to read. |
| `namespaceIndex` | [Int32](https://learn.microsoft.com/dotnet/api/system.int32) | The index of the namespace within that the node with the `nodeId` specified can be located. |
| `range` | [OpcRange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcrange/) | The [OpcRange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcrange/) to use to identify the single element or range of elements to read. |

**Returns**

[OpcValue](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcvalue/)

An instance of the [OpcValue](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcvalue/) class which stores the value requested.

**Exceptions**

| Exception | Condition |
|---|---|
| [ArgumentException](https://learn.microsoft.com/dotnet/api/system.argumentexception) | The `nodeId` is an empty string. |
| [ArgumentNullException](https://learn.microsoft.com/dotnet/api/system.argumentnullexception) | The `nodeId` is a null reference (Nothing in Visual Basic). |
| [InvalidOperationException](https://learn.microsoft.com/dotnet/api/system.invalidoperationexception) | The read service is currently not supported, especially using the arguments specified. |

## ReadNode(string, int, OpcAttribute, OpcRange)

<span class="api-meta">since v2.24</span>

Reads the `range` from the `attribute` of the node specified by `nodeId` and `namespaceIndex`.

<div class="api-signature" data-lang="csharp">

```csharp
public OpcValue ReadNode(
    string nodeId,
    int namespaceIndex,
    OpcAttribute attribute,
    OpcRange range)
```

</div>

<div class="api-signature" data-lang="vbnet">

```vbnet
Public Function ReadNode(
    nodeId As String,
    namespaceIndex As Integer,
    attribute As OpcAttribute,
    range As OpcRange) As OpcValue
```

</div>

**Parameters**

| Name | Type | Description |
|---|---|---|
| `nodeId` | [String](https://learn.microsoft.com/dotnet/api/system.string) | The textual node identifier of the node to read. |
| `namespaceIndex` | [Int32](https://learn.microsoft.com/dotnet/api/system.int32) | The index of the namespace within that the node with the `nodeId` specified can be located. |
| `attribute` | [OpcAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/) | One of the members defined by the [OpcAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/) enumeration that defines which node attribute is to be used by the service. |
| `range` | [OpcRange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcrange/) | The [OpcRange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcrange/) to use to identify the single element or range of elements to read. |

**Returns**

[OpcValue](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcvalue/)

An instance of the [OpcValue](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcvalue/) class which stores the value requested.

**Exceptions**

| Exception | Condition |
|---|---|
| [ArgumentException](https://learn.microsoft.com/dotnet/api/system.argumentexception) | The `nodeId` is an empty string. |
| [ArgumentNullException](https://learn.microsoft.com/dotnet/api/system.argumentnullexception) | The `nodeId` is a null reference (Nothing in Visual Basic). |
| [InvalidOperationException](https://learn.microsoft.com/dotnet/api/system.invalidoperationexception) | The read service is currently not supported, especially using the arguments specified. |

## ReadNode(int, int, OpcRange)

<span class="api-meta">since v2.24</span>

Reads the `range` from the [Value](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/#value) attribute of the node specified by `nodeId` and `namespaceIndex`.

<div class="api-signature" data-lang="csharp">

```csharp
public OpcValue ReadNode(int nodeId, int namespaceIndex, OpcRange range)
```

</div>

<div class="api-signature" data-lang="vbnet">

```vbnet
Public Function ReadNode(
    nodeId As Integer,
    namespaceIndex As Integer,
    range As OpcRange) As OpcValue
```

</div>

**Parameters**

| Name | Type | Description |
|---|---|---|
| `nodeId` | [Int32](https://learn.microsoft.com/dotnet/api/system.int32) | The numeric node identifier of the node to read. |
| `namespaceIndex` | [Int32](https://learn.microsoft.com/dotnet/api/system.int32) | The index of the namespace within that the node with the `nodeId` specified can be located. |
| `range` | [OpcRange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcrange/) | The [OpcRange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcrange/) to use to identify the single element or range of elements to read. |

**Returns**

[OpcValue](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcvalue/)

An instance of the [OpcValue](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcvalue/) class which stores the value requested.

**Exceptions**

| Exception | Condition |
|---|---|
| [ArgumentException](https://learn.microsoft.com/dotnet/api/system.argumentexception) | The `nodeId` is an empty string. |
| [ArgumentNullException](https://learn.microsoft.com/dotnet/api/system.argumentnullexception) | The `nodeId` is a null reference (Nothing in Visual Basic). |
| [InvalidOperationException](https://learn.microsoft.com/dotnet/api/system.invalidoperationexception) | The read service is currently not supported, especially using the arguments specified. |

## ReadNode(int, int, OpcAttribute, OpcRange)

<span class="api-meta">since v2.24</span>

Reads the `range` from the `attribute` of the node specified by `nodeId` and `namespaceIndex`.

<div class="api-signature" data-lang="csharp">

```csharp
public OpcValue ReadNode(
    int nodeId,
    int namespaceIndex,
    OpcAttribute attribute,
    OpcRange range)
```

</div>

<div class="api-signature" data-lang="vbnet">

```vbnet
Public Function ReadNode(
    nodeId As Integer,
    namespaceIndex As Integer,
    attribute As OpcAttribute,
    range As OpcRange) As OpcValue
```

</div>

**Parameters**

| Name | Type | Description |
|---|---|---|
| `nodeId` | [Int32](https://learn.microsoft.com/dotnet/api/system.int32) | The numeric node identifier of the node to read. |
| `namespaceIndex` | [Int32](https://learn.microsoft.com/dotnet/api/system.int32) | The index of the namespace within that the node with the `nodeId` specified can be located. |
| `attribute` | [OpcAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/) | One of the members defined by the [OpcAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcattribute/) enumeration that defines which node attribute is to be used by the service. |
| `range` | [OpcRange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcrange/) | The [OpcRange](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcrange/) to use to identify the single element or range of elements to read. |

**Returns**

[OpcValue](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcvalue/)

An instance of the [OpcValue](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcvalue/) class which stores the value requested.

**Exceptions**

| Exception | Condition |
|---|---|
| [ArgumentException](https://learn.microsoft.com/dotnet/api/system.argumentexception) | The `nodeId` is equals zero. |
| [ArgumentNullException](https://learn.microsoft.com/dotnet/api/system.argumentnullexception) | The `nodeId` is a null reference (Nothing in Visual Basic). |
| [InvalidOperationException](https://learn.microsoft.com/dotnet/api/system.invalidoperationexception) | The read service is currently not supported, especially using the arguments specified. |