We need to know which w3wp process is running now When we debug my website in the Visual Studio. As we know, we can use this cmd(%windir%/system32/inetsrv/appcmd list wp) to show the result in the windows2008. But, How to view the W3WP process by c#?
I give the method to you, please look this code:

        static void Main(string[] args)
        {
            string str = CmdListWP();
            Console.WriteLine(str);
            Console.WriteLine("Please press any key to exit!");
            Console.ReadLine();
        }private static string CmdListWP()
        {
            Process p = new Process();
            p.StartInfo.FileName = "cmd.exe";                    //设定调用程序的名称
            p.StartInfo.UseShellExecute = false;                  //关闭Shell的使用
            p.StartInfo.RedirectStandardInput = true;         //重定向标准输入
            p.StartInfo.RedirectStandardOutput = true;      //重定向标准输出
            p.StartInfo.RedirectStandardError = true;          //重定向错误输出
            p.StartInfo.CreateNoWindow = true;                //配置不显示窗口

            string output;
            p.Start();
            try
            {
                p.StandardInput.WriteLine("%windir%/system32/inetsrv/appcmd list wp");
                p.StandardInput.WriteLine("exit");
                output = p.StandardOutput.ReadToEnd();
            }
            finally
            {
                p.Close();
            }string result = string.Empty;
            if (output.IndexOf("WP \"") != -1) //是否有启动的站点
            {
                //正则表达式提取
                //for example: WP "29308" <applicationPool:profile3.csdn.net>
                string pattern = "WP \"\\d+\" .+";
                List<string> list = new List<string>();
                Regex regex = new Regex(pattern);
                if (regex.IsMatch(output))
                {
                    MatchCollection mc = regex.Matches(output);
                    for (int i = 0; i < mc.Count; i++)
                    {
                        list.Add(mc[i].Value);
                    }
                }
                foreach (string str in list)
                {
                    result += str + "\n";
                }
            }
            return result;
        }

Please take attention to the code: Process p = new Process();
we can use the Process object to run the cmd.exe process, and then run the "appcmd list wp" command. after it, we can receive the output string, and analyse the string to get the result of what we want to get.