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<p>That looks like it should work. Make sure you are putting a <code><asp:ScriptManager /></code> control on your page (or RadScriptManager if you are using Telerik, ToolkitScriptManager if you are using Microsoft's AjaxToolkit, etc.) </p> <p><strong>EDIT:</strong> Following is code that works correctly using <code>UpdatePanel</code> and the Bootstrap modal dialog you mentioned:</p> <pre><code><%@ Page Language="C#" AutoEventWireup="true" CodeBehind="bootstrap.aspx.cs" Inherits="TestWeb.bootstrap" %> <!DOCTYPE html> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title></title> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <link href="css/bootstrap.min.css" rel="stylesheet" media="screen"> <link rel="stylesheet" href="css/bootstrap-theme.min.css"> <script src="Scripts/jquery-1.8.2.js"></script> <script src="js/bootstrap.min.js"></script> </head> <body> <form id="form1" runat="server"> <asp:ScriptManager ID="ScriptManager1" runat="server" /> <a data-toggle="modal" href="#myModal" class="btn btn-primary btn-lg">Launch demo modal</a> <div class="modal fade" id="myModal" tabindex="-1" role="dialog" aria-labelledby="myModalLabel" aria-hidden="true"> <div class="modal-dialog"> <div class="modal-content"> <div class="modal-header"> <button type="button" class="close" data-dismiss="modal" aria-hidden="true">&times;</button> <h4 class="modal-title">Modal title</h4> </div> <div class="modal-body"> <asp:UpdatePanel ID="upd" runat="server" UpdateMode="Conditional"> <ContentTemplate> <asp:PlaceHolder id="p1" runat="server"> <asp:Literal id="lit1" runat="server" Text="Placeholder 1" /> </asp:PlaceHolder> <asp:PlaceHolder id="p2" runat="server" visible="false"> <asp:Literal id="lit2" runat="server" Text="Placeholder 2" /> </asp:PlaceHolder> </ContentTemplate> <Triggers> <asp:AsyncPostBackTrigger ControlID="btn" EventName="Click" /> </Triggers> </asp:UpdatePanel> </div> <div class="modal-footer"> <button type="button" class="btn btn-default" data-dismiss="modal">Close</button> <asp:Button ID="btn" runat="server" CssClass="btn btn-primary" Text="Save" OnClick="btn_Click" /> </div> </div> </div> </div> </form> </body> </html> </code></pre> <p>And in the code-behind:</p> <pre><code>protected void btn_Click(object sender, EventArgs e) { this.p1.Visible = false; this.p2.Visible = true; } </code></pre> <p>I would encourage you to create a test page in your app with just this markup to confirm that it works in your environment. Assuming it does, then I would take your problematic code and start pulling pieces out. Maybe put same plain text in the second <code>Placeholder</code> control instead of a couple of styled divs and a <code>Literal</code> that pulls its text from a resource file. Comment out your data update code so that all your Save button is doing is toggling visibility on the two <code>Placeholder</code> controls. If you still can't get it to work after stripping your page down to the bare minimum, then post more of your code and I'll take another look.</p>
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1. POHiding placeholder inside updatepanel from asp.net
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1. COI am using bootstrap modal popup and with above code it is not updating contents after data is saved. I didn't find any link from google as well. please suggest any solution.
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2. CO@DotnetSparrow I've updated my answer, hopefully this helps!
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