public void setResponse(Stream fs, string docname)
    {
        if (fs != null)
        {
            Response.Clear();
            Response.ContentType = "application/pdf";
            Response.AddHeader("content-length", fs.Length.ToString());
            Response.AddHeader("content-disposition", string.Format("attachment;filename={0}.pdf", docname));
            int Length = 256;
            Byte[] buffer = new Byte[Length];
            int bytesRead = fs.Read(buffer, 0, Length);
            // write the required bytes
            while (bytesRead > 0)
            {
                Response.OutputStream.Write(buffer, 0, bytesRead);
                bytesRead = fs.Read(buffer, 0, Length);
            }
            fs.Close();
            Response.Flush();
            Response.Close();
        }
    }