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The validated event works the same, only pass it the name textbox instead.
Here is just the validating event handler’s code: The event driven validation model in Win Forms is powerful and flexible enough to allow you to create high quality apps that implement robust and maintainable validation code in your forms.
This is very important, since this code WILL be reached if the clientside validation is not used, for some reason.
Once it comes to serverside validation, it's your job to make sure that no sensitive code is executed unless you want it to.
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You can use it to make sure that the user has entered something in a Text Box control.