class Program {  static void Main(string[] args)  {   for (int i = 1; i < 10; i++)   {    if (i % 3 == 1)    {     StorageDevice storge1 = new Upan("sandisk--" + i.ToString());     storge1.Inputdevice();     storge1.WriteDataToDevice();    }    else if (i % 3 == 2)    {     StorageDevice storge2 = new YingPan("westdata--" + i.ToString());     storge2.Inputdevice();     storge2.WriteDataToDevice();    }    else if (i % 3 == 0)    {     StorageDevice storge3 = new MobliePhone("iphone--" + i.ToString());     storge3.Inputdevice();     storge3.WriteDataToDevice();    }   }   Console.ReadKey();  } } abstract class StorageDevice {  public abstract void Inputdevice();  public abstract void WriteDataToDevice(); } class Upan : StorageDevice {  public Upan(string name)  {   this.Name = name;  }  private string Name;  public override void Inputdevice()  {   Console.WriteLine("U pan ({0}) input the computer.....", Name);  }  public override void WriteDataToDevice()  {   Console.WriteLine("U pan ({0}) write data.....", Name);  } } class MobliePhone : StorageDevice {  private string Name;  public MobliePhone(string name)  {   this.Name = name;  }  public override void Inputdevice()  {   Console.WriteLine("Mobile Phone ({0}) input the computer....", Name);  }  public override void WriteDataToDevice()  {   Console.WriteLine("Mobile Phone ({0}) write data....", Name);  } } class YingPan : StorageDevice {  public YingPan(string name)  {   this.Name = name;  }  public string Name { get; private set; }  public override void Inputdevice()  {   Console.WriteLine("Ying pan ({0}) input the computer...", Name);  }  public override void WriteDataToDevice()  {   Console.WriteLine("Ying pan ({0}) write data...", Name);  } }