Cut, Copy and Paste are the common commands used any application,
<TextBox CommandManager.PreviewExecuted="textBox_PreviewExecuted"
ContextMenu="{x:Null}" />
in above textbox code we can restrict these commands in PrviewExecuted event of CommandManager Class
and in code behind add below code and your job is done
private void textBox_PreviewExecuted(object sender, ExecutedRoutedEventArgs e)
{
if (e.Command == ApplicationCommands.Copy ||
e.Command == ApplicationCommands.Cut ||
e.Command == ApplicationCommands.Paste)
{
e.Handled = true;
}
}
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