# MailMerge.MergeBlockNamePrefix Property

> A static property returning the internal merge block name prefix “txmb_”. The name of a SubTextPart has to start with this prefix if it should be recognized as a repeating mail merge block by the merge methods of class MailMerge.

- **Product:** TX Text Control .NET for Windows Forms
- **Section:** Reference
- **Kind:** Property
- **Introduced:** 24.0
- **Namespace:** `TXTextControl.DocumentServer`
- **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 > MailMerge.MergeBlockNamePrefix Property
- **372 words**
- **Web URL:** https://docs.textcontrol.com/tx-text-control-dotnet-winforms/reference/txtextcontrol-documentserver/mailmerge/mergeblocknameprefix-property/
- **LLMs URL:** https://docs.textcontrol.com/tx-text-control-dotnet-winforms/reference/txtextcontrol-documentserver/mailmerge/mergeblocknameprefix-property/llms.txt
- **LLMs-Full URL:** https://docs.textcontrol.com/tx-text-control-dotnet-winforms/reference/txtextcontrol-documentserver/mailmerge/mergeblocknameprefix-property/llms-full.txt

---

### Description

A static property returning the internal merge block name prefix “txmb\_”. The name of a SubTextPart has to start with this prefix if it should be recognized as a repeating mail merge block by the merge methods of class MailMerge.

### Syntax

```csharp
public static string MergeBlockNamePrefix { get; }
```

```vbnet
Public Shared ReadOnly Property MergeBlockNamePrefix As String
```

### Examples

The following example includes the merge block name prefix value in application diagnostics. The created object is then available to the surrounding document workflow.

```csharp
Console.WriteLine($"Merge Block Name Prefix: {TXTextControl.DocumentServer.MailMerge.MergeBlockNamePrefix}");
Console.WriteLine("Mail Merge is ready for use.");
```

```vbnet
Console.WriteLine($"Merge Block Name Prefix: {TXTextControl.DocumentServer.MailMerge.MergeBlockNamePrefix}")
Console.WriteLine("Mail Merge is ready for use.")
```

### Limitations

Read only.

---

## Nearby

- **Previous:** [MailMerge.Merge Method](https://docs.textcontrol.com/tx-text-control-dotnet-winforms/reference/txtextcontrol-documentserver/mailmerge/merge-method/llms-full.txt)
- **Next:** [MailMerge.MergeBlocks Method](https://docs.textcontrol.com/tx-text-control-dotnet-winforms/reference/txtextcontrol-documentserver/mailmerge/mergeblocks-method/llms-full.txt)