using System;

using System.Collections.Generic;

using System.Linq;

​

public class Dog {

    public string Name {get; set;}

    public string Type {get; set;}

}

​

public class Program

{

    public static void Main()

    {

        var dogs = new HashSet<Dog> {

            new Dog() {Name = "Z", Type = "Beagle" },

            new Dog() {Name = "A", Type = "Beagle" },

            new Dog() {Name = "Q", Type = "Beagle" },

            new Dog() {Name = "B", Type = "Husky" },

            new Dog() {Name = "C", Type = "Poodle" },

            new Dog() {Name = "D", Type = "Greyhound" },

        };  

        var results = (from d in dogs select d).Distinct().ToList();

        foreach(Dog d in results) {

            Console.WriteLine(d.Name);

        }

    }

}