using System;

using System.Linq;

public class Program

{

    public static void Main()

    {

        var people = new[]

        {

            new

            {

                Name = "Vernon",

                Gender = "Male",

            },

                new

            {

                Name = "Carrie",

                Gender = "Female"

            },

                new

            {

                Name = "Thomas",

                Gender = "Male"

            }

        };

​

​

        // Method 3:

        var peopleByGender = from person in people

                             group person by person.Gender

                             into g

                             select new {Gender = g.Key, People = g};

​

​

        foreach (var genderGroup in peopleByGender)

        {

            Console.WriteLine(genderGroup.Gender);

            foreach (var person in genderGroup.People)

            {

                Console.WriteLine("  " + person.Name);

            }

        }

    }

}