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RichTextBox.Selection Property

Gets the TextSelection in the RichTextBox.

Namespace:  System.Windows.Controls
Assembly:  System.Windows (in System.Windows.dll)

public TextSelection Selection { get; }

Property Value

Type: System.Windows.Documents.TextSelection
A TextSelection that represents the selected text in the RichTextBox.

The following example shows how you can apply bold, italic, and underline formatting to the selected text.

Run this sample

<!--Create a RichTextBox and three buttons.-->
    <RichTextBox x:Name="MyRTB" Width="600" Height="400" />
    <StackPanel Orientation="Horizontal" HorizontalAlignment="Center">
        <Button Content="Bold" Height="30" Margin="2" Width="50" Click="BtnBold_Click" />
        <Button Content="Italic" Height="30" Margin="2" Width="50" Click="BtnItalic_Click" />
        <Button Content="Underline" Height="30" Margin="2" Width="65" Click="BtnUnderline_Click" />

//Set Bold formatting to selected content
private void BtnBold_Click(object sender, RoutedEventArgs e)
    if (MyRTB != null)
        if (MyRTB.Selection.GetPropertyValue(Run.FontWeightProperty) is FontWeight && ((FontWeight)MyRTB.Selection.GetPropertyValue(Run.FontWeightProperty)) == FontWeights.Normal)
            MyRTB.Selection.ApplyPropertyValue(Run.FontWeightProperty, FontWeights.Bold);
            MyRTB.Selection.ApplyPropertyValue(Run.FontWeightProperty, FontWeights.Normal);


//Set Italic formatting to selected content
private void BtnItalic_Click(object sender, RoutedEventArgs e)
    if (MyRTB != null)
        if (MyRTB.Selection.GetPropertyValue(Run.FontStyleProperty) is FontStyle && ((FontStyle)MyRTB.Selection.GetPropertyValue(Run.FontStyleProperty)) == FontStyles.Normal)
            MyRTB.Selection.ApplyPropertyValue(Run.FontStyleProperty, FontStyles.Italic);
            MyRTB.Selection.ApplyPropertyValue(Run.FontStyleProperty, FontStyles.Normal);


//Set Underline formatting to selected content
private void BtnUnderline_Click(object sender, RoutedEventArgs e)
    if (MyRTB != null)
        if (MyRTB.Selection.GetPropertyValue(Run.TextDecorationsProperty) == null)
            MyRTB.Selection.ApplyPropertyValue(Run.TextDecorationsProperty, TextDecorations.Underline);
            MyRTB.Selection.ApplyPropertyValue(Run.TextDecorationsProperty, null);



Supported in: 5, 4

Silverlight for Windows Phone

Supported in: Windows Phone OS 7.1

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.

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