BTW, here is some sample code that exhibits the problem:

using System;
using System.Reflection;
using System.Reflection.Emit;

namespace TestApp
{
   public class Test
   {
       public static void DoTest()
       {
           AppDomain appDomain = AppDomain.CurrentDomain;
           AssemblyName assemblyName = new AssemblyName();
           assemblyName.Name = "MyDynamicAssembly";
           AssemblyBuilder assemblyBuilder =
appDomain.DefineDynamicAssembly(assemblyName,
AssemblyBuilderAccess.RunAndSave);
           ModuleBuilder moduleBuilder =
assemblyBuilder.DefineDynamicModule("MyDynamicAssembly");
           TypeBuilder typeBuilder =
moduleBuilder.DefineType("MyDynamicClass", TypeAttributes.Public);
           ConstructorBuilder constructorBuilder =
typeBuilder.DefineDefaultConstructor(MethodAttributes.Public);
           typeBuilder.CreateType();
           assemblyBuilder.Save("MyDynamicAssembly.dll");
       }
   }
}