c#给一个方法添加一个角色才能执行

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;
using System.Security;
using System.Security.Principal;
using System.Security.Permissions;
namespace TestGenericIdentity
{
    class Program
    {
        private static string user1 = "ItsMe";
        private static string user2 = "Itsyou";
        static void Main(string[] args)
        {
            IIdentity genericIdentity = new GenericIdentity(user1,"MyAuthenticationType");

            string[] roles = { "Manager", "WebDev" };
            GenericPrincipal genericPrincipal = new GenericPrincipal(genericIdentity, roles);
            Thread.CurrentPrincipal = genericPrincipal;
            SomeMethod();
            Console.ReadKey();

        }
        [PrincipalPermission(SecurityAction.Demand, Role = @"Manager")]
        private static void SomeMethod()
        {
            IPrincipal principal = Thread.CurrentPrincipal;
            if (principal.Identity.Name.Equals(user1))
            {
                Console.WriteLine("Hello me!");
            }
            else if (principal.Identity.Name.Equals("ItsYou"))
            {
                Console.WriteLine("Hello you!");
            }
        }
    }
}