Shawn,

The namespace keyword allows you to create globally-unique types and are typically used in a hierarchal fashion.

using System;

namespace Hierarchy1
{
   /// <summary>
   /// Summary description for Class1.
   /// </summary>
   class Class1
   {
      /// <summary>
      /// The main entry point for the application.
      /// </summary>
      [STAThread]
      static void Main(string[] args)
      {
      //
      // TODO: Add code to start application here
      //
      }

      public void Test()
      {
      }
}

   namespace Hierarchy2
   {
      class Class2
      {
      }
   }
}

However using namespace inside of your type definition will generate a CS1519 compiler error which makes sense if you think in terms of type and not methods.

Regards
Neil