How to cancel a keystroke

[Guest]

Hello, guys,

How can we cancel a keystroke when a user types an invalid character in a
text box? For example, in a number only text box, a user types a letter, or
in a capital letter only text box, a user types a number or lower case letter.

Thanks.

 

[Earl]

Use one of the key events, such as KeyUp, parse for the keystroke you want
to cancel and set e.Cancel = True.