using System;

using System.Collections;

using System.Collections.Generic;

public class Program

{

    // Auto-property Initializers

    public class Post 

    {

        public DateTime DateCreated { get; private set; } = DateTime.Now;

        public string Title;

        public int Count;

    }

    public static void Main()

    {

        // Auto-property Initializers

        var post = new Post();

        Console.WriteLine(post.DateCreated.ToString());

        // Dictionary Initializers

        var dictionary = new Dictionary<string, string>

        {

             ["LAX"] = "Los Angeles International Airport",

             ["MEL"] = "Melbourne Tullamarine Airport"

        };      

        Console.WriteLine(dictionary["LAX"]);

        // String Interpolation

        var post2 = new Post() { Title = "title", Count = 5};

        var title = $"{post2.Title} {post2.Count}";

        Console.WriteLine(title);

        // Prior to C# 6

        Post first = null;

        var posts = new List<Post>();

        if (posts != null)

            first = posts[0];

​

        // C# 6

        var first2 = posts?[0];

    }

}