C#自定义异常

using System;  
public class InvalidAgeException : Exception  
{  
    public InvalidAgeException(String message)  
        : base(message)  
    {  
  
    }  
}  
public class TestUserDefinedException  
{  
    static void validate(int age)  
    {  
        if (age < 18)  
        {  
            throw new InvalidAgeException("Sorry, Age must be greater than 18");  
        }  
    }  
    public static void Main(string[] args)  
    {  
        try  
        {  
            validate(12);  
        }  
        catch (InvalidAgeException e) { Console.WriteLine(e); }  
        Console.WriteLine("Rest of the code");  
    }  
}