.Net执行cmd命令

using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using System.Diagnostics;

namespace WebForm
{
    public partial class _Default : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            Response.Write(ExeCommand("ping www.126.com"));
        }

        public string ExeCommand(string commandText)
        {
            Process p = new Process();
            p.StartInfo.FileName = "cmd.exe";
            p.StartInfo.UseShellExecute = false;
            p.StartInfo.RedirectStandardInput = true;
            p.StartInfo.RedirectStandardOutput = true;
            p.StartInfo.RedirectStandardError = true;
            p.StartInfo.CreateNoWindow = true;
            string strOutput = null;
            try
            {
                p.Start();
                p.StandardInput.WriteLine(commandText);
                p.StandardInput.WriteLine("exit");
                strOutput = p.StandardOutput.ReadToEnd();
                p.WaitForExit();
                p.Close();
            }
            catch (Exception e)
            {
                strOutput = e.Message;
            }
            return strOutput;
        }
    }
}