怎么实例化Class2啊

C# code

namespace ConsoleApplication1{    class Class1    {        public void showA()        {            Console.WriteLine("A");        }        public class Class2         {            public void showB()            {                Console.WriteLine("B");            }        }    }}

[解决办法]
Class1.Class2 cl = new Class1.Class2();
c1.showB();