对象数组如何排序？

class Program
    {
       class Data : IComparable
       {
        public string name;  //这些必需要加public,否则会出错的
        public int age;
        public void input()
        {
            Console.WriteLine("输入姓名");
            name = Console.ReadLine();
            Console.WriteLine("输入年龄");
            age = Convert.ToInt32(Console.ReadLine());
        }
        public int CompareTo(object obj)
        { Data mc = (Data)obj;
         if (this.age < mc.age) return -1;
         if (this.age>mc.age) return 1;
         return 0;

        }

      }

    static void Main(string[] args)
    {
            int i = 0;
            Data[] data = new Data[3];
            for (i = 0; i < 3; i++)
                data[i] = new Data();
            for (i = 0; i < 3; i++)
                data[i].input();
            Array.Sort(data);
            for (i = 0; i < 3; i++)
            {
                Console.Write("姓名:" + data[i].name);
                Console.WriteLine("年龄:" + data[i].age);
            }

            Console.ReadLine();
      }

    }