WPF TextBox insert new text

Question

When inserting a number in my textBox and then another number, for ex. 6 and then 3 I see: 63.
but i want that when I insert 6 and then 3 to see only: 3. 
i mean, that every Key comes instead of the one before and not added.
what should i do?

Answer 1

Handle PreviewKeyDown and set the Text property to empty string.
private void TextBox_PreviewKeyDown(object sender, KeyEventArgs e)
TextBox tb = sender as TextBox;
tb.Text = string.Empty;
You probably also want an if round that so if tab or enter is pressed you don't lose the old string.
Hope that helps.
Recent Technet articles: Property List Editing;
Dynamic XAML