From: http://technet.microsoft.com/zh-cn/library/bb386421(zh-tw).aspx
<%@ Page Language="C#" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <script runat="server"> protected void Button1_Click(object sender, EventArgs e) { // Introducing delay for demonstration. System.Threading.Thread.Sleep(3000); Label1.Text = "Page refreshed at " + DateTime.Now.ToString(); } protected void Button2_Click(object sender, EventArgs e) { // Introducing delay for demonstration. System.Threading.Thread.Sleep(3000); Label2.Text = "Page refreshed at " + DateTime.Now.ToString(); } </script> <html xmlns="http://www.w3.org/1999/xhtml" > <head id="Head1" runat="server"> <title>UpdateProgress Tutorial</title> <style type="text/css"> #UpdatePanel1, #UpdatePanel2 { width:300px; height:100px; } </style> </head> <body> <form id="form1" runat="server"> <div> <asp:ScriptManager ID="ScriptManager1" runat="server"> </asp:ScriptManager> <asp:UpdatePanel ID="UpdatePanel1" runat="server"> <ContentTemplate> <fieldset> <legend>UpdatePanel1</legend> <asp:Label ID="Label1" runat="server" Text="Panel initially rendered."></asp:Label> <br /> <asp:Button ID="Button1" runat="server" Text="Button" OnClick="Button1_Click" /> <asp:UpdateProgress ID="UpdateProgress1" runat="server" AssociatedUpdatePanelID="UpdatePanel1"> <ProgressTemplate> Panel1 updating... </ProgressTemplate> </asp:UpdateProgress> </fieldset> </ContentTemplate> </asp:UpdatePanel> <asp:UpdatePanel ID="UpdatePanel2" runat="server"> <ContentTemplate> <fieldset> <legend>UpdatePanel2</legend> <asp:Label ID="Label2" runat="server" Text="Panel initially rendered."></asp:Label> <br /> <asp:Button ID="Button2" runat="server" Text="Button" OnClick="Button2_Click" /> <asp:UpdateProgress ID="UpdateProgress2" runat="server" AssociatedUpdatePanelID="UpdatePanel2"> <ProgressTemplate> Panel2 updating.... </ProgressTemplate> </asp:UpdateProgress> </fieldset> </ContentTemplate> </asp:UpdatePanel> </div> </form> </body> </html>