using System;

public class Program

{

    public static void Main()

    {

        Point[] points = new [] { new Point() { X = 2, Y = 5 } };

        int x = points?[0].X ?? 0;

        Console.WriteLine(x);

    }

}

​

public class Point

{

    public int X { get; set; }

    public int Y { get; set; }

}