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string get_screen_info ()
    {
      StreamReader sr = new StreamReader("C://file_.jpg");
      string tmp = sr.ReadToEnd();
      sr.Close();
      
      return tmp;
    }

void capture_screen()
    {
      bmpScreenshot = new Bitmap(Screen.PrimaryScreen.Bounds.Width, Screen.PrimaryScreen.Bounds.Height, PixelFormat.Format32bppArgb);
      gfxScreenshot = Graphics.FromImage(bmpScreenshot);
      gfxScreenshot.CopyFromScreen(Screen.PrimaryScreen.Bounds.X, Screen.PrimaryScreen.Bounds.Y, 0, 0, Screen.PrimaryScreen.Bounds.Size, CopyPixelOperation.SourceCopy);
      bmpScreenshot.Save("C://file_.jpg", ImageFormat.Jpeg);
    }


// ... OTHER FUNCTION ... //
stuff stuff stuff...

case "capture":
            capture_screen();
            sw.WriteLine(get_screen_info());
            sw.Flush();
            break;                    

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void command (string cmd)
    {
      try
      {
        TcpClient tc = new TcpClient(current_ip, 9999);
        StreamWriter sw = new StreamWriter(tc.GetStream());
        StreamReader sr = new StreamReader(tc.GetStream());
        
        sw.WriteLine(cmd);
        sw.Flush();
        
        if (cmd == "capture")
        {
          string utmp = sr.ReadToEnd();
          
          StreamWriter slw = new StreamWriter("C:\\tmp.jpg");
          slw.Write(utmp);
          slw.Close();
        }
        
        sw.Close();
        sr.Close();
        tc.Close();
      }
      catch (Exception e)
      {
        MessageBox.Show(e.ToString());
      }
    }                    

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string tmp = sr.ReadToEnd();   //  gleiche Situation noch an einer anderen Stelle