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    <p>Looks like the <code>ModalPopupExtender</code> isn't designed this way. While it is <em>modal</em> (prevents the user from interacting with the rest of the page), it's not <em>blocking</em>, mean code continues to run after the form is called. That's because the popup is running on the client, and the code-behind runs the server. This is called a <a href="http://en.wikipedia.org/wiki/Callback_%28computer_programming%29" rel="nofollow">callback</a> because the client code <em>calls back</em> to the server when a action is taken.</p> <p>To make this work, you have to split the logic you after <code>SignoffModal.Show();</code> in an "Ok" part and a "Cancel" part by adding a <code>CancelControlID</code> attribute on <code>ModalPopupExtender</code> to point to the button that handles the Cancel action, then add the button: </p> <pre><code> &lt;!-- Signoff Modal Form --&gt; &lt;asp:HiddenField ID="SignoffForModal" runat="server" /&gt; &lt;ajaxToolkit:ModalPopupExtender runat="server" ID="SignoffModal" BehaviorID="modalPopupExtenderSignoff" TargetControlID="SignoffForModal" PopupControlID="popUpPaneSignoff" OkControlID="btnSignoff" // points to cancel button action CancelControlID="btnCancel" BackgroundCssClass="modalBackground"&gt; </code></pre> <p>... </p> <pre><code>&lt;asp:Button ID="btnSignoff" runat="server" Text="Signoff" /&gt; // handles Cancel action... &lt;asp:Button ID="btnCancel" runat="server" Text="Cancel" /&gt; ... &lt;!-- End Signoff Modal Form --&gt; </code></pre> <hr> <p>in the <code>btnSignoff</code> code-behind event handler:</p> <pre><code>{ // Do some work... </code></pre> <p>in the <code>btnCancel</code> code-behind event handler:</p> <pre><code>{ //throw some error... </code></pre>
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    1. COHi,so basically you are saying: It is not possible and that i have to continue processing using the code behind for btnsignoff. i can do this but id like the signoff modal + its code behind to be reuseable for other situations where i want username and password signoff. Is this correct as to what you are saying?
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      1. USuser1438082
    2. COYou can still make the code reusable, it's just that you'll have to wire up the code the way the ModalPopupExtender expects. This means having one block of code for Ok and another for Cancel. just make functions for each, and then in other apps call the functions in from the button even handler.
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    3. COi ended up setting a session variable to a value on the first function. Then i check what that session variable is set to and run through a list of switch statements to execute the required function when this second function is called.
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