public string SendFileViaTCP(string FileName, string IpEndPoint, int PortNo)
		{
			try
			{
				// Create a TCP socket.
				Socket client = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
				// Connect the socket to the remote endpoint.
				client.Connect(IpEndPoint, PortNo);
				// Send file file to remote computer
				client.SendFile(FileName);
				// Release the socket.
				client.Shutdown(SocketShutdown.Both);
				client.Close();
				
				return "file sent OK";
			}
			catch(Exception ex)
			{
				return string.Format("file failed to send {0}Exception:{0}{0}{1}" ,Environment.NewLine, ex.ToString());
			}
		}