block Backspace key

is there any way to block Backspace key in text field.Player should not be able to use back space key inside the text field is there way to block it.

Like this
http://forum.unity3d.com/threads/25033-how-to-disable-a-keyboard-key

You can try this code-

void OnGUI()
{
      if( Event.current.keyCode == KeyCode.Backspace && ( Event.current.type == EventType.KeyUp || Event.current.type == EventType.KeyDown ) )
        {
            Event.current.Use();
        }

------ your code --------
}