using System;

using System.Linq;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        var testList = new List<Stateful> { new Stateful { State = true } };

        Console.WriteLine(testList.FirstOrDefault()?.State == true);

    }

}

​

public class Stateful

{

    public bool State {get; set;}   

}