Free-ebooks-library - Bahar Ali Khan

The :: token is used for namespace alias qualification. In this example, we qualify
using the global namespace (this is most commonly seen in auto-generated code to
avoid name conflicts):
namespace N
{
class A
{
static void Main()
{
System.Console.WriteLine (new A.B());
System.Console.WriteLine (new global::A.B());
}
public class B {}
}
}
namespace A
{
class B {}
}
Here is an example of qualifying with an alias (adapted from the example in “Extern”
on page 60):
extern alias W1;
extern alias W2;
class Test
{
static void Main()
{
W1::Widgets.Widget w1 = new W1::Widgets.Widget();
W2::Widgets.Widget w2 = new W2::Widgets.Widget();
}
}
62 | Chapter 2: C# Language Basics