gistfile1.cs

private static void _GenerateMethod_Without_Return(TypeBuilder typeBuilder, string firstMethodName, Type[] parameterTypes)
{
    var methodBuilder = typeBuilder.DefineMethod(
            firstMethodName,
            MethodAttributes.Public | MethodAttributes.Virtual,
            typeof (void),
            parameterTypes);
    var methodIl = methodBuilder.GetILGenerator();

    methodIl.Emit(OpCodes.Ret);
}