# InputFormat.Bold Property

> Gets or sets a value specifying whether text is bold at the current input position. If text is selected, the property specifies this attribute for the whole selected text.

- **Product:** TX Text Control .NET for WPF
- **Section:** Reference
- **Kind:** Property
- **Introduced:** 16.0
- **Namespace:** `TXTextControl`
- **Package:** `TXTextControl.TextControl.WPF.SDK` (assembly `TXTextControl.dll`, from the private NuGet feed or Text Control Offline Packages)
- **.NET Framework:** reference `TXTextControl.dll` from the setup
- **Path:** TX Text Control .NET for WPF > Reference > TXTextControl > InputFormat.Bold Property
- **645 words**
- **Web URL:** https://docs.textcontrol.com/tx-text-control-dotnet-wpf/reference/txtextcontrol/inputformat/bold-property/
- **LLMs URL:** https://docs.textcontrol.com/tx-text-control-dotnet-wpf/reference/txtextcontrol/inputformat/bold-property/llms.txt
- **LLMs-Full URL:** https://docs.textcontrol.com/tx-text-control-dotnet-wpf/reference/txtextcontrol/inputformat/bold-property/llms-full.txt

---

### Description

Gets or sets a value specifying whether text is bold at the current input position. If text is selected, the property specifies this attribute for the whole selected text.

### Syntax

```csharp
public bool? Bold { get; set; }
```

```vbnet
Public Property Bold As Boolean?
```

### Examples

The following XAML example binds the Bold property to a check box:

```plaintext
<CheckBox
    Height="20"
    Name="checkBoxBold"
    IsChecked="{Binding ElementName=textControl1, Path=InputFormat.Bold, Mode=TwoWay}">
    Bold</CheckBox>
```

The following example changes the formatting applied to text entered at the end of a document by using `InputFormat.Bold`.

```csharp
textControl.Text = "Project summary";
textControl.InputPosition = new InputPosition(textControl.Text.Length);
InputFormat inputFormat = textControl.InputFormat;

inputFormat.Bold = true;
if (inputFormat.Bold != null)
{
    Console.WriteLine("Input Format: Bold is available.");
}
```

```vbnet
textControl.Text = "Project summary"
textControl.InputPosition = New InputPosition(textControl.Text.Length)
Dim inputFormat As InputFormat = textControl.InputFormat

inputFormat.Bold = True
If inputFormat.Bold IsNot Nothing Then
    Console.WriteLine("Input Format: Bold is available.")
End If
```

### Remarks

The property returns null when the text selection contains multiple characters with mixed setting.

---

## Nearby

- **Previous:** [InputFormat.AllFrameLines Property](https://docs.textcontrol.com/tx-text-control-dotnet-wpf/reference/txtextcontrol/inputformat/allframelines-property/llms-full.txt)
- **Next:** [InputFormat.BottomAligned Property](https://docs.textcontrol.com/tx-text-control-dotnet-wpf/reference/txtextcontrol/inputformat/bottomaligned-property/llms-full.txt)