public class Class1
{
        class InnerClass
        {
            string a;
            int b;
        }

        struct InnerStruct
        {
            int number1;
            int number2;
        }
}

 [TestMethod()]
public void getProtectedInnerClassTest()
{
     Type[] type = typeof(Class1).GetNestedTypes(System.Reflection.BindingFlags.NonPublic| System.Reflection.BindingFlags.Instance);
}