Setting the tells the control that it shouldn't do anything else with the character, and so if the key pressed isn't a digit or a backspace, it is not shown.
The purpose of this example is to give you a good grounding in manipulating properties and using events, not to create something that is incredibly useful.
How It Works The job of setting up the visual part of the form is now complete.
If you were to cancel further processing, that would effectively mean that it would be impossible to leave a text box until the data entered is valid.
The Because more than one text box is using this method to handle the event, you cannot be sure which is calling the function.
NET v1.0 by Karli Watson, David Espinosa, Zach Greenvoss, Jacob Hammer Pedersen, Christian Nagel, Jon D.