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Show Alert UpdatePanel

<%@ 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 btnDeleteAll_Click(object sender, EventArgs e)     {         if (FileHelper.DeleteAll() == true)         {             string script = @"alert('All Files Deleted Successfully!');";             ScriptManager.RegisterStartupScript(this, this.GetType(), "filesDeleted", script, true);         }     } </script> <html xmlns="http://www.w3.org/1999/xhtml"> <head id="Head1" runat="server">     <title>Show Alert UpdatePanel</title> </head> <body>     <form id="form1" runat="server">     <div>     <asp:ScriptManager         id="sm1"         Runat="server" />     <asp:UpdatePanel id="up1" runat="server">     <ContentTemplate>     UpdatePanel Time: <%= DateTime.Now.ToString("T") %>     <br />     <asp:Button         id="btnDeleteAll"         Text="Delete All Files"         OnClick="btnDeleteAll_Click"         Runat="server" />     </ContentTemplate>     </asp:UpdatePanel>     </div>     </form> </body> </html>