# OpcClientStateChangedEventArgs Class

> Reference: Provides the event data for the StateChanged event.

<dl class="api-definition">
<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">OpcClientStateChangedEventArgs Members</a></dd>
<dt>Also in</dt>
<dd>Opc.UaFx.Client</dd>
</dl>

Provides the event data for the [StateChanged](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcclient/statechanged) event.

## Syntax

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

```csharp
public class OpcClientStateChangedEventArgs : EventArgs
```

</div>

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

```vbnet
Public Class OpcClientStateChangedEventArgs
    Inherits EventArgs
```

</div>

## Inheritance

[Object](https://learn.microsoft.com/dotnet/api/system.object) → [EventArgs](https://learn.microsoft.com/dotnet/api/system.eventargs) → **OpcClientStateChangedEventArgs**

## Constructors

| Name | Description |
|---|---|
| [OpcClientStateChangedEventArgs](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcclientstatechangedeventargs/members#opcclientstatechangedeventargs) | Initializes a new instance of the OpcClientStateChangedEventArgs class using the specified `oldState` and `newState`. |

## Properties

| Name | Description |
|---|---|
| [NewState](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcclientstatechangedeventargs/members#newstate) | Gets the state after the change. |
| [OldState](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcclientstatechangedeventargs/members#oldstate) | Gets the state before the change. |

Inherits members from [EventArgs](https://learn.microsoft.com/dotnet/api/system.eventargs).

## Applies to

| Package | Versions |
|---|---|
| Opc.UaFx.Advanced | v2.5–v2.59 |