In C# you can create a class which doesn't have any declared namespace
- just don't use a namespace declaration. Is there a difference between
that and the kind of class you can create in C++ or VB.NET?

Stoitcho,

   That's not true.  It was meant for the following example:

namespace Acme
{
   public class MyClass {}
}

namespace MySystem
{
   public class Acme
   {
       public class MyClass {}
   }

   public class MyOtherClass
   {
       public Acme.MyClass MyAcmeClass;
   }
}

   In the example above, the compiler would always resolve the MyAcmeClass
to the type MySystem.Acme.MyClass.  If you wanted it to be Acme.MyClass,
there was no way to do it until C# 2.0.  In C# 2.0, you would use:

   public class MyOtherClass
   {
       public global::Acme.MyClass MyAcmeClass;
   }

   To indicate that you shouldn't use the local namespace scope, but
rather, the root namespace.

   While the other cases might be true, the primary reason was for the
above case (I was there when the C# team presented this feature to a closed
customer council).