# DataSourceManager.DataRelationsChanged Event

> Is fired when the contents of the DataRelations property change.

- **Product:** TX Text Control .NET for Windows Forms
- **Section:** Reference
- **Kind:** Event
- **Introduced:** 24.0
- **Namespace:** `TXTextControl.DocumentServer.DataSources`
- **Package:** `TXTextControl.TextControl.WinForms.SDK` (assembly `TXDocumentServer.dll`, from the private NuGet feed or Text Control Offline Packages)
- **.NET Framework:** reference `TXDocumentServer.dll` from the setup
- **Path:** TX Text Control .NET for Windows Forms > Reference > TXTextControl.DocumentServer.DataSources > DataSourceManager.DataRelationsChanged Event
- **318 words**
- **Web URL:** https://docs.textcontrol.com/tx-text-control-dotnet-winforms/reference/txtextcontrol-documentserver-datasources/datasourcemanager/datarelationschanged-event/
- **LLMs URL:** https://docs.textcontrol.com/tx-text-control-dotnet-winforms/reference/txtextcontrol-documentserver-datasources/datasourcemanager/datarelationschanged-event/llms.txt
- **LLMs-Full URL:** https://docs.textcontrol.com/tx-text-control-dotnet-winforms/reference/txtextcontrol-documentserver-datasources/datasourcemanager/datarelationschanged-event/llms-full.txt

---

### Description

Is fired when the contents of the [DataRelations](https://docs.textcontrol.com/tx-text-control-dotnet-winforms/reference/txtextcontrol-documentserver-datasources/datasourcemanager/datarelations-property/llms-full.txt) property change.

### Syntax

```csharp
public event EventHandler DataRelationsChanged;
```

```vbnet
Public Event DataRelationsChanged As EventHandler
```

### Examples

The following example records useful context when data relations changed occurs.

```csharp
dataSourceManager.DataRelationsChanged += (sender, e) =>
{
    Console.WriteLine($"Data Relations Changed at {DateTime.Now:u}");
};
```

```vbnet
AddHandler dataSourceManager.DataRelationsChanged,
    Sub(sender, e)
        Console.WriteLine($"Data Relations Changed at {DateTime.Now:u}")
    End Sub
```

---

## Nearby

- **Previous:** [DataSourceManager.DataRelations Property](https://docs.textcontrol.com/tx-text-control-dotnet-winforms/reference/txtextcontrol-documentserver-datasources/datasourcemanager/datarelations-property/llms-full.txt)
- **Next:** [DataSourceManager.DataRowMerged Event](https://docs.textcontrol.com/tx-text-control-dotnet-winforms/reference/txtextcontrol-documentserver-datasources/datasourcemanager/datarowmerged-event/llms-full.txt)