Question

I have a textbox that should disallow entering any special characters.

The user can enter :

1. A-Z
2. a-z
3. 0-9
4. Space

How can I make the KeyDown event to do this?

Answer 1

private void _txtPath_KeyDown(object sender, KeyEventArgs e)
  {
     if ((e.Key < Key.A) || (e.Key > Key.Z))
        e.Handled = true;
  }