private static void CreateProperty(this TypeBuilder tb, string propertyName, Type propertyType)
        {
            var fieldBuilder = tb.DefineField("_" + propertyName, propertyType, FieldAttributes.Private);
            var propertyBuilder = tb.DefineProperty(propertyName, PropertyAttributes.HasDefault, propertyType, null);
            var attrs = MethodAttributes.Public | MethodAttributes.SpecialName | MethodAttributes.HideBySig;
            var getPropMthdBldr = tb.DefineMethod("get_" + propertyName, attrs, propertyType, Type.EmptyTypes);
            var getIl = getPropMthdBldr.GetILGenerator();

            getIl.Emit(OpCodes.Ldarg_0);
            getIl.Emit(OpCodes.Ldfld, fieldBuilder);
            getIl.Emit(OpCodes.Ret);

            var setPropMthdBldr = tb.DefineMethod("set_" + propertyName, attrs, null, new[] { propertyType });
            var setIl = setPropMthdBldr.GetILGenerator();

            setIl.MarkLabel(setIl.DefineLabel());
            setIl.Emit(OpCodes.Ldarg_0);
            setIl.Emit(OpCodes.Ldarg_1);
            setIl.Emit(OpCodes.Stfld, fieldBuilder);

            setIl.Emit(OpCodes.Nop);
            setIl.MarkLabel(setIl.DefineLabel());
            setIl.Emit(OpCodes.Ret);

            propertyBuilder.SetGetMethod(getPropMthdBldr);
            propertyBuilder.SetSetMethod(setPropMthdBldr);
        }

var tb = moduleBuilder.DefineType(typeName,
                    TypeAttributes.Public |
                    TypeAttributes.Class |
                    TypeAttributes.AutoClass |
                    TypeAttributes.AnsiClass |
                    TypeAttributes.BeforeFieldInit |
                    TypeAttributes.AutoLayout,
                    null,
                    new[] { interfaceType });

            foreach (var property in interfaceType.GetProperties())
                tb.CreateProperty(property.Name, property.PropertyType);