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Platform : ASP.NET
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Category : Client Side Scripting

How to pop up a message box when no item in the dropdownlist is selected before postback?

  • Make sure to add a ListItem with Text="Please Choose" and Value ="".
  • Add a RequiredFieldValidator with ControlToValidate= <Dropdownlist1> and Display="Dynamic"
  • Add a ValidationSummary with ShowMessageBox =true

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