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Attribute in class inheritance

using System; using System.Security; using System.Security.Permissions; using System.Security.Principal; using System.Threading; public class Starter {     public static void Main() {         GenericIdentity g = new GenericIdentity("Person1");         GenericPrincipal p = new GenericPrincipal(g,new string[] { "Manager" });         Thread.CurrentPrincipal = p;         MyClass.MethodA();         YClass.MethodA();     } } [PrincipalPermission(SecurityAction.Demand, Role = "Manager")] public class MyClass {     static public void MethodA() {         Console.WriteLine("MyClass.MethodA");     } } [PrincipalPermission(SecurityAction.Demand,Role = "Accountant")] public class YClass : MyClass {     static public void MethodB() {         Console.WriteLine("MyClass.MethodB");     } }