C# pop up window return value

I would like to do a pop up window in the C# code when a button is clicked and have it return true or false.  How would I accomplish this
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Miguel OzSoftware EngineerCommented:
Use ModalPopUp Extender control from AJAX library and you can manipulate the pop up based on the logic you want to implement.
Rahul AgarwalTeam LeaderCommented:
You can use Modal Popup Extender:

<asp:Panel ID="Panel1" runat="server" CssClass="ModalPopup ">
                    <table class="Table">
                            <td class="label" align="center" colspan="2">
                                <asp:ImageButton ID="Button2" runat="server" />
                <asp:ModalPopupExtender ID="modalpop" runat="server" TargetControlID="Button1"
                    PopupControlID="Panel1" BackgroundCssClass="modalBackground" CancelControlID="close">

Modal Popup Dialog Window in ASP.NET

For JQuery Form


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