<ItemTemplate> 
        <tr > 
            <td> 
                <asp:Label ID="PeriodLabel" runat="server" Text='<%# Eval("Period") %>' /> 
            </td> 
            <td> 
                
               <asp:LinkButton Label ID = "StatementLabel" runat="server" Visible='<%# !string.IsNullOrWhiteSpace(Eval("Statement").ToString()) %>' 
NavigateUrl='<%# "~/Reports/" + Eval("Statement") %>' Text='Download' Onclick="LinkButtonDownloadPdf_Click"></asp:LinkButton> 
  
            </td> 
        </tr> 
    </ItemTemplate>

protected void LinkButtonDownloadPdf_Click(object sender, EventArgs e) 
    { 
        //Response.ContentType = "Application/pdf"; 
        //Response.AppendHeader("Content-Disposition", "attachment; filename=Test_PDF.pdf"); 
        //Response.TransmitFile(Server.MapPath("~/Reports/FD3_2012-07_Stmt.pdf")); 
        //Response.End(); 
        // Get the physical Path of the file(test.doc) 
 
        
         
        string filepath = Server.MapPath("~/Reports/" + Request.QueryString["Statement"]); 
 
        // Create New instance of FileInfo class to get the properties of the file being downloaded 
        FileInfo file = new FileInfo(filepath); 
 
        // Checking if file exists 
        if (file.Exists) 
        { 
            // Clear the content of the response 
            Response.Clear(); 
            Response.ClearHeaders(); 
            Response.ClearContent(); 
 
 
            //Response.Flush();  
            // LINE1: Add the file name and attachment, which will force the open/cance/save dialog to show, to the header 
            Response.AddHeader("Content-Disposition", "inline;filename=" + file.Name); 
 
            // Add the file size into the response header 
            Response.AddHeader("Content-Length", file.Length.ToString()); 
 
            // Set the ContentType 
            Response.ContentType = ReturnExtension(file.Extension.ToLower()); 
 
            // Write the file into the response (TransmitFile is for ASP.NET 2.0. In ASP.NET 1.1 you have to use WriteFile instead) 
            Response.TransmitFile(file.FullName); 
 
            // End the response 
            Response.Buffer = true; 
            Response.Flush(); 
            Response.End(); 
        } 
       
    } 
        private string ReturnExtension(string fileExtension) 
{ 
    switch (fileExtension) 
    { 
        case ".htm": 
        case ".html": 
        case ".log": 
            return "text/HTML"; 
        case ".txt": 
            return "text/plain"; 
        case ".doc": 
            return "application/ms-word"; 
        case ".tiff": 
        case ".tif": 
            return "image/tiff"; 
        case ".asf": 
            return "video/x-ms-asf"; 
        case ".avi": 
            return "video/avi"; 
        case ".zip": 
            return "application/zip"; 
        case ".xls": 
        case ".csv": 
            return "application/vnd.ms-excel"; 
        case ".gif": 
            return "image/gif"; 
        case ".jpg": 
        case "jpeg": 
            return "image/jpeg"; 
        case ".bmp": 
            return "image/bmp"; 
        case ".wav": 
            return "audio/wav"; 
        case ".mp3": 
            return "audio/mpeg3"; 
        case ".mpg": 
        case "mpeg": 
            return "video/mpeg"; 
        case ".rtf": 
            return "application/rtf"; 
        case ".asp": 
            return "text/asp"; 
        case ".pdf": 
            return "application/pdf"; 
        case ".fdf": 
            return "application/vnd.fdf"; 
        case ".ppt": 
            return "application/mspowerpoint"; 
        case ".dwg": 
            return "image/vnd.dwg"; 
        case ".msg": 
            return "application/msoutlook"; 
        case ".xml": 
        case ".sdxl": 
            return "application/xml"; 
        case ".xdp": 
            return "application/vnd.adobe.xdp+xml"; 
        default: 
            return "application/octet-stream"; 
    } 
    }