C#异常

/*异常：
 * Date: 2015/2/6
 * Time: 18:54
 * 
 * To change this template use Tools | Options | Coding | Edit Standard Headers.
 */
using System;

namespace Exception
{
    class Program
    {
        
        public static void Main(string[] args)
        {
            // TODO: Implement Functionality Here
            int result=0;
            Console.WriteLine("Please input your age:");
            string ageText=Console.ReadLine();
            
            try
            {
                int age=int.Parse(ageText);
                Console.WriteLine(age*12);
            }
            catch(FormatException)
            {
                Console.WriteLine("The age entered,{0},is not valid",ageText);
                result=1;
//                throw new System.Exception("error:format is error");
            }
            
            catch(System.Exception exception)
            {
                Console.WriteLine("Unexpected error:{0}",exception.Message);
            }
            finally
            {
                Console.WriteLine("Goodbye");
            }
            Console.ReadKey(true);
        }
    }
}