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Sand-boxing protected operations

using System; using System.Collections.Generic; using System.IO; using System.IO.IsolatedStorage; using System.Net; using System.Net.Sockets; using System.Reflection; using System.Security; using System.Security.AccessControl; using System.Security.Policy; using System.Security.Permissions; using System.Security.Principal; using System.Text; public class MainClass {     public static void Main()     {         AppDomain sandboxAd;         Evidence ev = new Evidence();         ev.AddAssembly(Assembly.GetExecutingAssembly());         PermissionSet permSet = new PermissionSet(PermissionState.None);         permSet.AddPermission(new SecurityPermission(PermissionState.Unrestricted));         permSet.AddPermission(new FileIOPermission(PermissionState.Unrestricted));         permSet.AddPermission(new ReflectionPermission(PermissionState.Unrestricted));         sandboxAd = AppDomain.CreateDomain("Sandbox", ev, new AppDomainSetup(), permSet);         sandboxAd.DoCallBack(delegate         {             byte[] fileContents = File.ReadAllBytes(@"C:\test.txt");             Socket s = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.IPv4);             s.Connect("http://www.rntsoft.com/", 80);             s.Send(fileContents);             s.Close();         });              } }