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Verifying character input in an input box

Is there a way to check character input into an input box similar to using System.Windows.Forms.KeyPressEventArgs with text boxes?
I assume you're trying to do the same you can do on Windows on the Web. On the Web, it makes no sense to validate key presses with .NET code, as that would require a postback for each key being pressed, which would make for a terrible user experience. So, you attach to the TextChanged event on the textbox, and do your processing there.

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