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cheap windows 7 professional serial key 2015 n t blank. It s perfect for TextBox controls representing required fields in a form because if any of those TextBoxes is blank, the RequiredFieldValidator won t allow the form to be submitted to the server. Here s an example that verifies that a TextBox named EMail isn t blank asp TextBox ID EMail RunAt server asp RequiredFieldValidator ControlToValidate EMail ErrorMessage Required field Display static Run.

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