introductory-examples/program-organization/2/client.cs - A client of classes in different namespaces.

Lecture 4 - slide 19 : 29 Program 4

// A client program
// In source file client.cs


/*
  Namespace N1
    public class C1
  Namespace N2
    internal class C2 
    public class C3 
    Namespace N3
      public class C4
*/

using N1;
using N2;
using N2.N3;

public class Client{
  C1 v = new C1(); 

  // The type or namespace name 'C2' could not be found.
  // C2 w = new C2();   
  C3 x = new C3(); 
  C4 y = new C4(); 
}