AJAX :: Display Modal Popup After Validation Is Successful

May 7, 2015

I have 1textbox and 1 button==BtnPopupL in page..I define RequiredFieldValidator for text box and use  ModalPopupExtender for button below is code:

<asp:UpdatePanel ID="Uptload1" runat="server">
<ContentTemplate>
<asp:ModalPopupExtender DropShadow="true" ID="ModalPopupExtender3" PopupControlID="PnPopupL"
runat="server" TargetControlID="BtnPopupL">

[code]..

here when I click on button it will show popup but I want if users don't type any text in textbox if they click on button it doesn't show popup and show error that I define in RequiredFieldValidator...here when I don't type text in textbox  when I click on button it show both(popup and  Required FieldValidator) but I want it doesn't show popup untill I type text in textbox...

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[Code] ....

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