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            Process p = new Process();
            p.StartInfo.FileName="ping";
            p.StartInfo.Arguments="127.0.0.1";
            p.StartInfo.CreateNoWindow = true;
            p.Start();
            textBox1.Text = p.StandardOutput.ReadToEnd();					

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   private void button1_Click(object sender, EventArgs e)
   {
      Process p = new Process();
      p.StartInfo.UseShellExecute = false;
      p.StartInfo.RedirectStandardOutput = true;
      p.StartInfo.FileName = "ping";
      p.StartInfo.Arguments = "192.168.0.254";
      p.OutputDataReceived += new DataReceivedEventHandler(p_OutputDataReceived);
      p.Start();
      p.BeginOutputReadLine();
    }

    void p_OutputDataReceived(object sender, DataReceivedEventArgs e)
    {
      if (e.Data == null)
      {
        return;
      }
      if (listBox1.InvokeRequired)
      {
        listBox1.Invoke(
          (MethodInvoker)delegate()
          {
            listBox1.Items.Add(e.Data.ToString());
        });
      }
      else
      {
        listBox1.Items.Add(e.Data.ToString());
      }
    }
  }