public partial class DownLoadFile : System.Web.UI.Page

    {

        protected void Page_Load(object sender, EventArgs e)

        {

            string picName = Request.QueryString["InternalSysURL"];

            if (!String.IsNullOrEmpty(picName))

            {

                byte[] content = this.GetImageContent(picName);

                this.WriteResponse(picName, content);

            }

        }

 

        #region

        private byte[] GetImageContent(string picName)

        {

            string fileURL = GetImgUrlPrefix() + picName;

 

            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(fileURL);

            request.AllowAutoRedirect = true;

 

            WebProxy proxy = new WebProxy();

            proxy.BypassProxyOnLocal = true;

            proxy.UseDefaultCredentials = true;

 

            request.Proxy = proxy;

 

            WebResponse response = request.GetResponse();

 

            using (Stream stream = response.GetResponseStream())

            {

                using (MemoryStream ms = new MemoryStream())

                {

                    Byte[] buffer = new Byte[1024];

                    int current = 0;

                    while ((current = stream.Read(buffer, 0, buffer.Length)) != 0)

                    {

                        ms.Write(buffer, 0, current);

                    }

                    return ms.ToArray();

                }

            }

        }

 

        private void WriteResponse(string picName, byte[] content)

        {

            Response.Clear();

            Response.ClearHeaders();

            Response.Buffer = false;

            Response.ContentType = "application/octet-stream";

            Response.AppendHeader("Content-Disposition", "attachment;filename=" + HttpUtility.UrlEncode(picName, Encoding.Default));

            Response.AppendHeader("Content-Length", content.Length.ToString());

            Response.BinaryWrite(content);

            Response.Flush();

            Response.End();

        }

 

        private static string GetImgUrlPrefix()

        {

            XmlDocument xmlDoc = new XmlDocument();

            xmlDoc.Load(AppDomain.CurrentDomain.BaseDirectory + "//Pages//ItemMaintain//ImageDownLoad.xml");

            XmlNodeList nodes = xmlDoc.GetElementsByTagName("ProductImageOriginal");

            if (nodes.Count > 0)

            {

                return nodes[0].ChildNodes[0].Value;

            }

            else { return ""; }

        }

 

        #endregion

    }