Use of global contextual keyword

The global is contextual keyword, when it comes before the :: operator, refers to the global namespace of .Net

Check example :

namespace TestWinform.test

{

    public class globalClass

    {

        public void TestMethod()

        {

            // Here you can able to access Default system Namespace of .Net framework

            global::System.Console.Write("");

            // This is the class of   "TestWinform.test"  namespace

            System sys = new System();

            sys.Console();

        }       

    }

    public class System

    {

        public void Console()

        {

        }

    }

}