Kind of an interesting mental exercise. Say you wanted to enumerate all the classes in any particular namespace. Unfortunately there doesn't appear to be a way to say, "Get all classes in a namespace" using reflection, so you kind of have to roll your own implementation. But, this is how I did it....

namespace TestingGroundsCSharpConsole
{
    class Program
    {
        static void Main(string[] args)
        {
            Assembly a = Assembly.GetExecutingAssembly();
            List<String> namespaces = new List<string>();
            foreach (Type t in a.GetTypes())
            {
                if (t.Namespace == "TestingGroundsCSharpConsole")
                    namespaces.Add(t.Name);
            }

            foreach (String s in namespaces)
                Console.WriteLine(s);

            Console.ReadLine();

            return;
        }
    }

    class Class1
    {
        private Int32 _myInt;
    }

    class Class2
    {
        private Int32 _myotherInt;
    }
}

....the output is

Program
Class1
Class2