SecurityAction.Demand
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(); } }