# OpcNodeIdCollection Members
> Reference: Represents a collection of OpcNodeId instances.
- Type
- OpcNodeIdCollection
- Namespace
- Opc.UaFx
- Assembly
- Opc.UaFx.Advanced.dll
- Package
- Opc.UaFx.Advanced v2.59.0
- Also in
- Opc.UaFx.Client
Inherits members from [Collection<OpcNodeId>](https://learn.microsoft.com/dotnet/api/system.collections.objectmodel.collection-1).
## Constructors
### OpcNodeIdCollection
2 overloads
| Overload | Description |
|---|---|
| [OpcNodeIdCollection()](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeidcollection/members#opcnodeidcollection-noparams) | Initializes a new instance of the [OpcNodeIdCollection](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeidcollection/) class. |
| [OpcNodeIdCollection(IList<OpcNodeId>)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeidcollection/members#opcnodeidcollection-system-collections-generic-ilist-of-opc-uafx-opcnodeid) | Initializes a new instance of the [OpcNodeIdCollection](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeidcollection/) class as a wrapper for the specified `list`. |
#### OpcNodeIdCollection()
Initializes a new instance of the [OpcNodeIdCollection](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeidcollection/) class.
```csharp
public OpcNodeIdCollection()
```
```vbnet
Public Sub New()
```
#### OpcNodeIdCollection(IList<OpcNodeId>)
Initializes a new instance of the [OpcNodeIdCollection](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeidcollection/) class as a wrapper for the specified `list`.
```csharp
public OpcNodeIdCollection(IList list)
```
```vbnet
Public Sub New(list As IList(Of OpcNodeId))
```
**Parameters**
| Name | Type | Description |
|---|---|---|
| `list` | [IList](https://learn.microsoft.com/dotnet/api/system.collections.generic.ilist-1)<[OpcNodeId](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeid/)> | The [IList<T>](https://learn.microsoft.com/dotnet/api/system.collections.generic.ilist-1) of [OpcNodeId](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeid/) values to wrap. |
**Exceptions**
| Exception | Condition |
|---|---|
| [ArgumentNullException](https://learn.microsoft.com/dotnet/api/system.argumentnullexception) | The `list` is a null reference (Nothing in Visual Basic). |
## Methods
### ClearItems
protected · override
Removes all elements from the collection.
```csharp
protected override void ClearItems()
```
```vbnet
Protected Overrides Sub ClearItems()
```
**Overrides**
[ClearItems()](https://learn.microsoft.com/dotnet/api/system.collections.objectmodel.collection-1.clearitems)
### InsertItem
protected · override
Inserts the `item` into the collection at the `index` specified.
```csharp
protected override void InsertItem(int index, OpcNodeId item)
```
```vbnet
Protected Overrides Sub InsertItem(index As Integer, item As OpcNodeId)
```
**Parameters**
| Name | Type | Description |
|---|---|---|
| `index` | [Int32](https://learn.microsoft.com/dotnet/api/system.int32) | The zero-based index at which the `item` is to be inserted. |
| `item` | [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/) to insert. |
**Exceptions**
| Exception | Condition |
|---|---|
| [ArgumentOutOfRangeException](https://learn.microsoft.com/dotnet/api/system.argumentoutofrangeexception) | The `index` is less than zero or greater than the number of elements in the collection. |
**Overrides**
[InsertItem(int, OpcNodeId)](https://learn.microsoft.com/dotnet/api/system.collections.objectmodel.collection-1.insertitem)
### RemoveItem
protected · override
Removes the element at the `index` specified from the collection.
```csharp
protected override void RemoveItem(int index)
```
```vbnet
Protected Overrides Sub RemoveItem(index As Integer)
```
**Parameters**
| Name | Type | Description |
|---|---|---|
| `index` | [Int32](https://learn.microsoft.com/dotnet/api/system.int32) | The zero-based index of the element to remove. |
**Exceptions**
| Exception | Condition |
|---|---|
| [ArgumentOutOfRangeException](https://learn.microsoft.com/dotnet/api/system.argumentoutofrangeexception) | The `index` is less than zero or equal to or greater than the number of elements in the collection. |
**Overrides**
[RemoveItem(int)](https://learn.microsoft.com/dotnet/api/system.collections.objectmodel.collection-1.removeitem)
### SetItem
protected · override
Replaces the element at the `index` specified with the `item`.
```csharp
protected override void SetItem(int index, OpcNodeId item)
```
```vbnet
Protected Overrides Sub SetItem(index As Integer, item As OpcNodeId)
```
**Parameters**
| Name | Type | Description |
|---|---|---|
| `index` | [Int32](https://learn.microsoft.com/dotnet/api/system.int32) | The zero-based index of the element to replace. |
| `item` | [OpcNodeId](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeid/) | The new [OpcNodeId](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeid/) at the `index`. |
**Exceptions**
| Exception | Condition |
|---|---|
| [ArgumentOutOfRangeException](https://learn.microsoft.com/dotnet/api/system.argumentoutofrangeexception) | The `index` is less than zero or equal to or greater than the number of elements in the collection. |
**Overrides**
[SetItem(int, OpcNodeId)](https://learn.microsoft.com/dotnet/api/system.collections.objectmodel.collection-1.setitem)