Download feature not working within update panel in asp.net

Question

I have a Web User Control containing a FormView. The formview shows details of job seeker. I have provided a button for "Download Resume" link, so that admin/HR can download the resume. I have placed this control in an aspx page that contains the UpdatePanel. Everything works fine except Download Link.

I have given a Command on donwload link button and a function is associated with the command to start download.

Below is the code i have implemented -

//Command on 'Download' link button within FormView protected void lnkDownload_Command(object sender, CommandEventArgs e) {     if (e.CommandName.Equals("Download"))     {         StartDownload(e.CommandArgument.ToString());     } }  //My routine to download document //sFileInfo contains filepath$==$mimetype protected void StartDownload(string sFileInfo) {     string[] d = sFileInfo.ToString().Split((new string[] { "$==$" }), StringSplitOptions.None);     string filename = d[0];     string docType = d[1];      System.IO.FileInfo file = new System.IO.FileInfo(d[0]);      if (file.Exists)     {         Response.Clear();         Response.AddHeader("Content-Disposition", "attachment; filename=" + d[0]);         Response.AddHeader("Content-Length", file.Length.ToString());         Response.ContentType = d[1];         Response.WriteFile(file.FullName);         Response.End();     }     else     {         Server.Transfer("~/Mesgbox.aspx?cat=2");     } } 

The code works perfectly if update panel is removed but generates script errors if update panel is used.

Any suggestions....?

Thanks for sharing your time.

Answer 1

To initiate a full page postback, you add a postback trigger to your update panel:

<asp:UpdatePanel runat="server">     <Triggers>         <asp:PostBackTrigger ControlID="YourControlID" />     </Triggers>     <ContentTemplate>         ..... 

Answer 2

You cannot return an attachment in an UpdatePanel partial postback, since the results are used by the ScriptManager to update a DIV (not the whole response). The simplest fix for what you're trying to do would be to make your download button as a postback control. That would cause that button to initiate a full postback. Here's the code below to include in your Page_Load

ScriptManager.GetCurrent(this.Page).RegisterPostBackControl(this.lnkDownload);