PostBack on OKButton click AJAX Modal PopUp Extender - ASP.NET


I have a modal popup extender control in my ASP.NET application. I set its property "popupcontrolid="Panel1". Where Panel1 is having OK and Cancel Buttons. I want to postback when OK button is clicked and do NOT want to postback when CANCEL button is clicked. I set modal popup extender control properties like this too:


Can you please provide me the code for that ?

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<asp:Button ID="OkButton" runat="server" onclick="OkButton_Click" Text="Ok" />
<asp:Button ID="Button1" runat="server" OnClientClick="javascript:return (false);" Text="Cancel" />

instead of return (false); write a javascript function which will close the popup.
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