using System;
using System.Reflection; 
using System.Runtime.Remoting;
using System.Globalization;

class App
{
   static void Main()
   {
      AppDomain.CurrentDomain.AssemblyResolve 
         += new ResolveEventHandler(ResolveAssembly);
      try
      {
         object obj = FromAssembly("lib");
         InvokeObject(obj);
      }
      catch(Exception e)
      {
         Console.WriteLine(e.GetType().ToString());
      }
   }
   static Assembly ResolveAssembly(object sender, ResolveEventArgs args) 
   {
      string[] name = args.Name.Split();
      string assem = name[0].Substring(0, name[0].Length-1);
      return Assembly.LoadFrom(assem + ".old");
   }
   static object UsePartialName(string name)
   {
      Assembly a = Assembly.LoadWithPartialName(name);
      Type type = a.GetType("LibraryCode");
      ConstructorInfo ctor = type.GetConstructor(Type.EmptyTypes);
      return ctor.Invoke(null);
   }
   static object UseAppDomain(string name)
   {
      AppDomain ad = AppDomain.CurrentDomain;
      return ad.CreateInstanceAndUnwrap(name, "LibraryCode");
   }
   static object FromAssembly(string shortName)
   {
      Console.WriteLine("Use Assembly.Load");
      AssemblyName name = new AssemblyName();
      name.Name = shortName;
      name.Version = new Version("1.0.0.0");
      name.CultureInfo = new CultureInfo("");
      byte[] pkt 
         = new byte[] {0xed,0xe6,0x78,0x9f,0xb0,0xb1,0x32,0x19};
      name.SetPublicKeyToken(pkt);
      Assembly a = Assembly.Load(name);
      Type type = a.GetType("LibraryCode");
      ConstructorInfo ctor = type.GetConstructor(Type.EmptyTypes);
      return ctor.Invoke(null);
   }
   static object UseActivator(string name)
   {
      ObjectHandle oh 
         = Activator.CreateInstance(name, "LibraryCode");
      return oh.Unwrap();
   }
   static object FromFile(string fileName)
   {
      System.IO.FileStream fs = System.IO.File.OpenRead(fileName);
      byte[] data = new byte[fs.Length];
      fs.Read(data, 0, data.Length);
      fs.Close(); 

      Assembly a = Assembly.Load(data);
      Type type = a.GetType("LibraryCode");
      ConstructorInfo ctor = type.GetConstructor(Type.EmptyTypes);
      return ctor.Invoke(null);
   }
   static void InvokeObject(object obj)
   {
      Type type = obj.GetType();
      MethodInfo mi = type.GetMethod("GetVersion");
      string version = (string)mi.Invoke(obj, null);
      Console.WriteLine(version);
   }
}