static void Main(String[] args)
Console.Write("Press a number key:");
key =Convert.ToChar(Console.ReadLine());
case '0':Console.WriteLine("You Pressed 0");break;
case '1':Console.WriteLine("You Pressed 1");break;
case '2':Console.WriteLine("You Pressed 2");break;
case '3':Console.WriteLine("You Pressed 3");break;
case '4':Console.WriteLine("You Pressed 4");break;
case '5':Console.WriteLine("You Pressed 5");break;
case '6':Console.WriteLine("You Pressed 6");break;
case '7':Console.WriteLine("You Pressed 7");break;
case '8':Console.WriteLine("You Pressed 8");break;
case '9':Console.WriteLine("You Pressed 9");break;
default: Console.WriteLine("Not allowed!");break;