ASP.NET

string path = clientServerXRef1.GetDownloadpath(company.ToUpper());
            System.IO.FileStream fs = null;
            fs = System.IO.File.Open(path + company.ToUpper() + "_" + projectID + ".mpp", System.IO.FileMode.Open);
            byte[] btFile = new byte[fs.Length];
            fs.Read(btFile, 0, Convert.ToInt32(fs.Length));
            fs.Close();
            Response.AddHeader("Content-disposition", "attachment; filename=" + projectID + ".mpp");
            Response.ContentType = "application/octet-stream";
            Response.BinaryWrite(btFile);

Page.RegisterStartupScript("Error", "<script>var agree=confirm('Are you sure you want to delete?')</script>");
if (agree)
{
    string service = grid.DataKeys[e.RowIndex].Value.ToString();
    StringCollection col = BlogService.LoadPingServices();
    col.Remove(service);
    BlogService.SavePingServices(col);

    BindGrid();
}
else
{

    //Response.Redirect(Request.RawUrl);
}