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copied!<p>Try this: </p> <p>In the HTML of the <strong>MasterPage</strong>: </p> <p>Define an event handler for <strong>LinkButtonLogin</strong>'s onclick event:</p> <pre><code><asp:linkbutton id="LinkButtonLogin" runat="server" text="Login" onclick="LinkButtonLogin_Click"></asp:linkbutton> </code></pre> <p>Create a dummy button that is hidden from view. Then, for the <strong>ModalPopupExtender</strong>, change the <strong>TargetControlID</strong> of the <strong>ModalPopupExtender</strong> control from <strong>LinkButtonLogin</strong> to <strong>ButtonInvisible</strong>. This effectively fakes the <strong>ModalPopupExtender</strong> into being hideable/showable from your code.</p> <pre><code><asp:button id="ButtonInvisible" runat="server" style="display: none;" /> </code></pre> <p>In the codebehind of the <strong>MasterPage</strong>:</p> <pre><code>protected void Page_Load(object sender, EventArgs e) { /* This adds a client-side event to your HyperLink control that mimics LinkButtonLogin's onclick event, but ONLY if the current user is not logged in. */ if (!UserIsLoggedIn()) { HyperLinkUserList.Attributes.Add("onclick", "document.getElementById('" + LinkButtonLogin.ClientID + "').click();"); } } protected void LinkButtonLogin_Click(object sender, EventArgs e) { // check if the user is logged in. if (!UserIsLoggedIn()) { // show the modal login window ModalPopupExtender.Show(); } else { /* This assumes that you always want a user to go to the UserList page upon being logged in. You can add some code here to redirect to different pages based on certain criteria. */ Response.Redirect("userlist.aspx"); } } </code></pre>

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