不显示窗口后台运行程序

Process myProcess = new Process();

myProcess.StartInfo.FileName = "cmd.exe";
myProcess.StartInfo.UseShellExecute =false;
myProcess.StartInfo.CreateNoWindow = true;//notice here!
myProcess.StartInfo.RedirectStandardInput =true;
myProcess.StartInfo.RedirectStandardOutput = true;
myProcess.StartInfo.RedirectStandardError = true;
myProcess.Start();
StreamWriter sIn = myProcess.StandardInput;
sIn.AutoFlush = true;

StreamReader sOut  = myProcess.StandardOutput;
StreamReader sErr= myProcess.StandardError;
string cmd="dir";
sIn.Write(cmd+System.Environment.NewLine);
sIn.Write("exit" + System.Environment.NewLine);

string s;
string e;
s = sOut.ReadToEnd();
e = sErr.ReadToEnd();

if(myProcess.HasExited==false)
{
myProcess.Kill();
}
sIn.Close();
sOut.Close();
sErr.Close();