using System;
using System.Security.Principal;
using System.Security.Permissions;

namespace Demo
{
    class MainClass
    {
        public static void Invoke (Action action)
        {
            try {
                action ();
            } catch (Exception ex) {
                Console.WriteLine (ex.Message);
            }
        }

        public static void Main (string[] args)
        {
            
            Invoke (() => TestMethod1 ());
            Invoke (() => TestMethod2 ());
            Invoke (() => TestMethod3 ());
            Console.ReadKey ();
        }

        [PrincipalPermission(SecurityAction.Demand,Name="Administrator")]
        public static void TestMethod1()
        {
            Console.WriteLine ("TestMethod1 successfully Executed!");
        }        
        [PrincipalPermission(SecurityAction.Demand,Role="Administrators")]
        public static void TestMethod2()
        {
            Console.WriteLine ("TestMethod2 successfully Executed!");
        }        
        [PrincipalPermission(SecurityAction.Demand,Role="Guests")]
        public static void TestMethod3()
        {
            Console.WriteLine ("TestMethod3 successfully Executed!");
        }
    }
}