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What is the best way to block certain input keys from being used in a TextBox with out blocking special keystrokes such as Ctrl–V/Ctrl–C?
For example, only allowing the user to enter a subset of characters or numerics such as A or B or C and nothing else.
I would use the keydown-event and use the e.cancel to stop the key if the key is not allowed. If I want to do it on multiple places then I would make a user control that inherits a textbox and then add a property AllowedChars or DisallowedChars that handle it for me. I have a couple of variants laying around that I use for time to time, some allowing money-formatting and input, some for time editing and so on.
The good thing to do it as a user control is that you can add to it and make it to your own killer-text-box. 😉