using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
 
namespace TestIComparable
{
  public class Person : IComparable<Person>
  {
    public string Name { get; set; }
 
    public int Age { get; set; }
 
    public int CompareTo(Person obj)
    {
      int result;
      if (this.Name == obj.Name && this.Age == obj.Age)
      {
        result = 0;
      }
      else
      {
        if (this.Name.CompareTo(obj.Name) > 0)
        {
          result = 1;
        }
        else if (this.Name == obj.Name && this.Age > obj.Age)
        {
          result = 1;
        }
        else
        {
          result = -1;
        }
      }
 
      return result;
    }
 
    public override string ToString()
    {
      return this.Name + "-" + this.Age;
    }
  }
}

public class Program
{
  public static void Main(string[] args)
  {
    List<Person> lstPerson = new List<Person>();
    lstPerson.Add(new Person(){ Name="Bob",Age=19});
    lstPerson.Add(new Person(){ Name="Mary",Age=18});
    lstPerson.Add(new Person() { Name = "Mary", Age = 17 });
    lstPerson.Add(new Person(){ Name="Lily",Age=20});
    lstPerson.Sort();
    Console.ReadKey();
  }
}

public static void Main(string[] args)
{
  List<Person> lstPerson = new List<Person>();
  lstPerson.Add(new Person(){ Name="Bob",Age=19});
  lstPerson.Add(new Person(){ Name="Mary",Age=18});
  lstPerson.Add(new Person() { Name = "Mary", Age = 17 });
  lstPerson.Add(new Person(){ Name="Lily",Age=20});

  lstPerson.Sort((x,y) =>
  {
 int result;
 if (x.Name == y.Name && x.Age == y.Age)
 {
   result = 0;
 }
 else
 {
   if (x.Name.CompareTo(y.Name) > 0)
   {
 result = 1;
   }
   else if (x.Name == y.Name && x.Age > y.Age)
   {
 result = 1;
   }
   else
   {
 result = -1;
   }
 }

 return result;
  });
  Console.ReadKey();
}