处理未在'switch'语句中指定的值

Question

我有一个带有数字按钮的“安全面板”，允许用户在TextBox控件中输入密码（代码）。我正在switch声明中处理此密码。

问题：当用户输错密码时，我想显示“拒绝访问”的日期和时间。我怎么能这样做？

代码：

string password = inputtxt.Text;

switch (password)
{
    case "1432":
        listBox.Items.Add(DateTime.Now + " " + "INFO First Year Students"); 
        break;
    case "2543":
        listBox.Items.Add(DateTime.Now + " " + "INFO Second Year Students"); 
        break;
    case "3543":
        listBox.Items.Add(DateTime.Now + " " + "B.Tech Students"); 
        break;
    case "2645":
    case "2646":
    case "2647":
    case "2648":
        listBox.Items.Add(DateTime.Now + " " + "CSIT Faculty"); 
        break;
    case "8888":
        listBox.Items.Add(DateTime.Now + " " + "IET Staff"); 
        break;
    case "":
        listBox.Items.Add(DateTime.Now + " " + "Pl Enter a Valid Code"); 
        break;
    case "0":
        listBox.Items.Add(DateTime.Now + " " +
            "Received Request - Will be there   shortly"); 
        break;
}

inputtxt.Text = "";

Answer 1

为什么不向default添加switch案例：

default:
     MessageBox.Show("Access denied");
     break;