Easy FTP Upload without files size limit

using System.Net;

            // Get the object used to communicate with the server.
            FtpWebRequest request = (FtpWebRequest)FtpWebRequest.Create("ftp://
            XXXXXXXXXXXXXXXXXXXXX/" + "C:/XXXXX.zip");
            request.Method = WebRequestMethods.Ftp.UploadFile;
            request.Credentials = new NetworkCredential("User", "PassWord");

            // Copy the contents of the file to the request stream.
            Stream ftpStream = request.GetRequestStream();
            FileStream file = File.OpenRead("C:/XXXXX.zip");

            int length = 1024;
            byte[] buffer = new byte[length];
            int bytesread = 0;

            do
            {
            bytesread = file.Read(buffer,0,length);
            ftpStream.Write(buffer,0,bytesread);
            }
            while(bytesread != 0);

            file.Close();
            ftpStream.Close();

            MessageBox.Show("Uploaded Successfully");