public static void UploadFile(string strFilePath, string strSavePath, string strURL)

        {

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

            string strBoundry = "------------" + System.DateTime.Now.Ticks.ToString("x");

            // The trailing boundary string

            byte[] boundaryBytes = Encoding.ASCII.GetBytes("\r\n--" + strBoundry + "\r\n");

            StringBuilder sb = new StringBuilder();

            sb.Append("--");

            sb.Append(strBoundry);

            sb.Append("\r\n");

            sb.Append("Content-Disposition: form-data; name=\"");

            sb.Append("A.txt");

            sb.Append("\"; filename=\"");

            sb.Append(Path.GetFileName(strFilePath));

            sb.Append("\"");

            sb.Append("\r\n");

            sb.Append("Content-Type: ");

            sb.Append("application/octet-stream");

            sb.Append("\r\n");

            sb.Append("\r\n");

            string strPostHeader = sb.ToString();

            byte[] postHeaderBytes = Encoding.UTF8.GetBytes(strPostHeader);

            // The WebRequest

            HttpWebRequest oWebrequest = (HttpWebRequest)WebRequest.Create(strURL);

            oWebrequest.ContentType = "multipart/form-data; boundary=" + strBoundry;

            oWebrequest.Method = "POST";

            // This is important, otherwise the whole file will be read to memory anyway...

            oWebrequest.AllowWriteStreamBuffering = false;

            // Get a FileStream and set the final properties of the WebRequest

            FileStream oFileStream = new FileStream(strFilePath, FileMode.Open, FileAccess.Read);

            long length = postHeaderBytes.Length + oFileStream.Length + boundaryBytes.Length;

            oWebrequest.ContentLength = length;

            Stream oRequestStream = oWebrequest.GetRequestStream();

            // Write the post header

            oRequestStream.Write(postHeaderBytes, , postHeaderBytes.Length);

            // Stream the file contents in small pieces (4096 bytes, max).

            byte[] buffer = new Byte[checked((uint)Math.Min(, (int)oFileStream.Length))];

            int bytesRead = ;

            while ((bytesRead = oFileStream.Read(buffer, , buffer.Length)) != )

                oRequestStream.Write(buffer, , bytesRead);

            oFileStream.Close();

            // Add the trailing boundary

            oRequestStream.Write(boundaryBytes, , boundaryBytes.Length);

            WebResponse oWResponse = oWebrequest.GetResponse();

            Stream s = oWResponse.GetResponseStream();

            StreamReader sr = new StreamReader(s);

            String sReturnString = sr.ReadToEnd();

            // Clean up

            oFileStream.Close();

            oRequestStream.Close();

            s.Close();

            sr.Close();

            //return sReturnString;

        }

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

    {

        protected void Page_Load(object sender, EventArgs e)

        {

            if (Request.Files.Count > 0)

            {

                try

                {

                    HttpPostedFile file = Request.Files[0];

                    string filePath = this.MapPath("UploadDocument") + "\\" + file.FileName;

                    if (!Directory.Exists(Path.GetDirectoryName(filePath)))

                    {

                        Directory.CreateDirectory(Path.GetDirectoryName(filePath));

                    }

                    file.SaveAs(filePath);

                    Response.Write("Success/r/n");

                }

                catch(Exception ex)

                {

                    Response.Write("Error/r/n");

                }

            }

        }

    }