C # advanced------Mobile Storage device case

namespace Removable Storage device 03{    publicabstractclass  yidong    {        public Abstract void Write ();          Public Abstract void Reade ();    }}

namespaceMobile Storage Device 03{//MP3 class    classMp3:yidong { Public Override voidWrite () {Console.WriteLine ("Mp3 in writing ..."); }         Public Override voidReade () {Console.WriteLine ("Mp3 is reading ..."); }    }}

namespace Mobile Storage device 03{    // Computer class      computer    {        public  getset;}          Public void Write ()        {            yd. Write ();        }          Public void Reade ()        {            yd. Reade ();     }}}

usingSystem;usingSystem.Collections.Generic;usingSystem.Linq;usingSystem.Text;usingSystem.Threading.Tasks;namespaceMobile Storage Device 03{classProgram {Static voidMain (string[] args) {Computer COM=Newcomputer (); Com.yd=NewUpan ();//yidong yd = new Upan com.            Write (); Com.            Reade ();        Console.readkey (); }    }}

C # advanced------Mobile Storage device case