Multilayer Programming Sample in .NET

Of course, nothing hard:

namespace TopLayer {
    using BottomLayer;
    using MiddleLayer;

    internal class TotallyAdHocTrash {
        ApplicationFieldSpecificStuff stuff = new ApplicationFieldSpecificStuff();
        static void Main() {
            //...
            Application.Run();
        } //Main
    } //class TotallyAdHocTrash

    //...

} //namespace TopLayer

namespace MiddleLayer {
    using BottomLayer;

    public class CoolApplicationFieldSpecificStuff {
        CoolAbsolutelyUniversalSystemUtility Utility = new AbsolutelyUniversalSystemUtility();
        //...
    } //class CoolApplicationFieldSpecificStuff

    //...

} //namespace MiddleLayer

namespace BottomLayer {

    public class AbsolutelyUniversalSystemUtility {
        public void AbsolutelyUniversalMethod() { /* ... */ }
        //...
    } //class AbsolutelyUniversalSystemUtility

    //...

} //namespace BottomLayer

If this is not enough, add some more layers. :-)
If this does not seem not informative enough, look at your own question. And finally try to realize: nobody needs layers without the purpose.

—SA