C# sorting

example.cs

// array of custom type
User[] users = new User[3] { new User("Betty", 23),  // name, age
                             new User("Susan", 20),
                             new User("Lisa", 25) };

// sort array by name
Array.Sort(users, delegate(User user1, User user2) {
                    return user1.Name.CompareTo(user2.Name);
                  });
// write array (output: Betty23 Lisa25 Susan20)
foreach (User user in users) Console.Write(user.Name + user.Age + " ");

// sort array by age
Array.Sort(users, delegate(User user1, User user2) {
                    return user1.Age.CompareTo(user2.Age); // (user1.Age - user2.Age)
                  });
// write array (output: Susan20 Betty23 Lisa25)
foreach (User user in users) Console.Write(user.Name + user.Age + " ");