# MailMerge.BlockMerging Event

> Occurs when a merge block is about to be merged. The event handler receives an argument of type BlockMergingEventArgs containing data related to this event.

- **Product:** TX Text Control .NET for WPF
- **Section:** Reference
- **Kind:** Event
- **Introduced:** 23.0
- **Namespace:** `TXTextControl.DocumentServer`
- **Package:** `TXTextControl.TextControl.WPF.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 WPF > Reference > TXTextControl.DocumentServer > MailMerge.BlockMerging Event
- **334 words**
- **Web URL:** https://docs.textcontrol.com/tx-text-control-dotnet-wpf/reference/txtextcontrol-documentserver/mailmerge/blockmerging-event/
- **LLMs URL:** https://docs.textcontrol.com/tx-text-control-dotnet-wpf/reference/txtextcontrol-documentserver/mailmerge/blockmerging-event/llms.txt
- **LLMs-Full URL:** https://docs.textcontrol.com/tx-text-control-dotnet-wpf/reference/txtextcontrol-documentserver/mailmerge/blockmerging-event/llms-full.txt

---

### Description

Occurs when a merge block is about to be merged. The event handler receives an argument of type [BlockMergingEventArgs](https://docs.textcontrol.com/tx-text-control-dotnet-wpf/reference/txtextcontrol-documentserver/mailmerge-blockmergingeventargs/llms-full.txt) containing data related to this event.

### Syntax

```csharp
public event MailMerge.BlockMergingHandler BlockMerging;
```

```vbnet
Public Event BlockMerging As MailMerge.BlockMergingHandler
```

### Examples

The following example records useful context when block merging occurs.

```csharp
mailMerge.BlockMerging += (sender, e) =>
{
    Console.WriteLine($"Block Name: {e.BlockName}");
};
```

```vbnet
AddHandler mailMerge.BlockMerging,
    Sub(sender, e)
        Console.WriteLine($"Block Name: {e.BlockName}")
    End Sub
```

---

## Nearby

- **Previous:** [MailMerge.BarcodeMergedEventArgs.BarcodeFrame Property](https://docs.textcontrol.com/tx-text-control-dotnet-wpf/reference/txtextcontrol-documentserver/mailmerge-barcodemergedeventargs/barcodeframe-property/llms-full.txt)
- **Next:** [MailMerge.BlockMergingEventArgs Class](https://docs.textcontrol.com/tx-text-control-dotnet-wpf/reference/txtextcontrol-documentserver/mailmerge-blockmergingeventargs/llms-full.txt)