ASP.NET MD5加密

public ActionResult Index()
{
string a = CreateMD("zrh");
ViewBag.pw = CreateMD(a);
return View();
}
public string CreateMD(string password)
{
byte[] result = Encoding.Default.GetBytes(password);
MD5 md5 = new MD5CryptoServiceProvider();
byte[] output = md5.ComputeHash(result);
return BitConverter.ToString(output).Replace("-", "");
}