private void startSever()
        {
            try
            {
                set1("Listening");
                IPEndPoint ip = new IPEndPoint(IPAddress.Parse(ipServer.Text), int.Parse(port.Text));
                tcpListener = new TcpListener(ip);
                tcpListener.Start();
                socketForClient = tcpListener.AcceptSocket();
                if (socketForClient.Connected)
                {
                    NetworkStream ns = new NetworkStream(socketForClient);
                    StreamReader sr = new StreamReader(ns);
                    StreamWriter sw = new StreamWriter(ns);
                    string filename = txtFileName.Text;
                    nwkStream = new NetworkStream(socketForClient);
                    stmReader = File.OpenRead(txtFileName.Text);
                    stmWriter = nwkStream;
                    FileInfo flInfo = new FileInfo(txtFileName.Text);
                    long size = Convert.ToInt64(flInfo.Length);
                    byte  []   buff = new byte  [32 * 2048]  ;
                    int len = 0;
                    long progress = 0;
                    set1("Starting");
                    sw.WriteLine(filename);
                    sw.Flush();
                    while ((len = stmReader.Read(buff, 0, 2048)) != 0)
                    {
                        progress += len;
                        set3(size, progress);
                        set(progress.ToString() + " Byte of " + size + " Byte");
                        stmWriter.Write(buff, 0, len);
                        stmWriter.Flush();
                    }
                    set1("File has sent succesfully!");
                }
            }
            catch (Exception ex)
            {

                MessageBox.Show(ex.ToString());
            }
            finally
            {
                if (socketForClient != null)
                {
                    socketForClient.Close();
                    nwkStream.Close();
                    stmWriter.Close();
                    stmReader.Close();
                    tcpListener.Stop();
                }
            }
        }