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Declarative role-based security

using System; using System.IO; using System.Security.Permissions; [PrincipalPermissionAttribute(SecurityAction.Demand, Role="Administrators")] class MainClass {   public static void Main()    {     FileStream fsOut = File.Create(@"c:\\temp\\test.txt");     StreamWriter sw = new StreamWriter(fsOut);     sw.WriteLine("str");     sw.Flush();     sw.Close();   } } Unhandled Exception: System.Security.SecurityException: Request for principal permission failed. at System.Security.Permissions.PrincipalPermission.ThrowSecurityException() at System.Security.Permissions.PrincipalPermission.Demand() at System.Security.PermissionSet.DemandNonCAS() at MainClass.Main() The action that failed was: Demand The type of the first permission that failed was: System.Security.Permissions.PrincipalPermission The first permission that failed was: The demand was for: The assembly or AppDomain that failed was: mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089