I use a validation control to check if value entered is numeric. When I type letter in the textbox, the error messages shows for a second, then the application continues, and eventually throw exception.
I'm going to add server side validation in code behind. But I wonder why the validation control doesn't stop the application. I don't see any difference between this web form and other web forms where validation controls work fine.
Could somebody tell me what may be the cause? I'll appreciate your help!
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