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public static void p_OutputDataReceived(object sender, DataReceivedEventArgs e)
      {
      cmdvalue = e.Data;
      Console.WriteLine(cmdvalue);
      StreamWriter sw = new StreamWriter("out.txt");
      sw.Write(cmdvalue);
      sw.Close();
      } 


public static string execute_p (string cmd)
    {
      string tmp = "";
      
      try
      {
        Process p = new Process();
          p.StartInfo.UseShellExecute = false;
          p.StartInfo.RedirectStandardOutput = true;
          p.StartInfo.FileName = cmd;
         // p.StartInfo.Arguments = "192.168.0.254";
          p.OutputDataReceived += new DataReceivedEventHandler(p_OutputDataReceived);
          p.Start();
          p.BeginOutputReadLine(); 
          
      
        return cmdvalue;
      }
      catch 
      {
        return "error";
      }
    }