AJAX :: Set TextBox Text Property On Submit Button Click In Modalpopupextender?

Mar 24, 2011

I have a modalpopupextender with popupcontrolid set to a panel. I have a name textbox, label, submit button in the panel. When the submit button is clicked the name is validated using a function connecting to the DB. If It already exists the label should show "Already Exists". I have set the label text in the buttonclick event handler but the label is no set. The popup just closes. I want the label to be set and make the popup remain unclosed. How to achieve this functionality ?

<asp:ModalPopupExtender ID="ModalPopupExtender" runat="server"
TargetControlID="NewUserButton"
PopupControlID="NewUserPanel"
BackgroundCssClass="modalBackground"
OnOkScript="onOk()"
CancelControlID="CancelBtnNewUser"....

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