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Remove Formatting Of Last Selected Text In A WPF RichTextBox Control

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Here's how to remove the formatting of last selected text in a WPF RichTextBox control from it's SelectionChanged event.
C# Code 
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private void rtbEditor_SelectionChanged(object sender, RoutedEventArgs e)
{
    //Clear previous selections.
    TextRange textRange = new TextRange(rtbEditor.Document.ContentStart, rtbEditor.Document.ContentEnd);
    textRange.ClearAllProperties();
}

Output
Remove Formatting Of Last Selected Text In A WPF RichTextBox Control

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