using System;
class ifselect
{
    public static void Main()
    {
        string ddr;
        do
        {
            Console.WriteLine("My address book\n");
            Console.WriteLine("A-   add new address");
            Console.WriteLine("D-  delete address");
            Console.WriteLine("M-  modify address");
            Console.WriteLine("V-  view address");
            Console.WriteLine("Q-  quit address");
            Console.WriteLine("ddr(A,D,M,VorQ):");
            ddr = Console.ReadLine();
            switch (ddr)
            {
                case "a":
                case "A": Console.WriteLine("You wish to add an address");
                    break;
                case "d":
                case "D": Console.WriteLine("You wish to delete address");
                    break;
                case "m":
                case "M": Console.WriteLine("You wish to modify address");
                    break;
                case "v":
                case "V": Console.WriteLine("You wish to view address");
                    break;
                case "q":
                case "Q": Console.WriteLine("Bye ");
                    break;
                default:
                    Console.WriteLine("{0} is not a chose", ddr);
            }
            Console.WriteLine("please any key to continue ...");
            Console.ReadLine();
            Console.WriteLine();
        } while (ddr != "q" && ddr != "Q");
       
    }
错误    1    控制不能从一个 case 标签(“default:”)贯穿到另一个 case 标签    C:\Documents and Settings\user\My Documents\Visual Studio 2005\Projects\lianxi\lianxi\Program.cs    34    17    lianxi