how to textbox validate not accept apostrophe(name's)

The above might work for web coding but not for a windows application. I'm sure it can be done by checking the keydown event but I think that may impact performance. If you are saving the data, then you can do what I do instead of not accepting it, Just don't save it. So that it looks right when I redisplay it, I replace ' with `. but if you don't care about that you can just remove the '.

String savefield  = textbox.Text.Replace("'","`");
or
String savefield  = textbox.Text.Replace("'","");