using System;

using System.Linq;

using System.Collections.Generic;

​

public class Program

{

    public static void Main()

    {

        var data = Enumerable.Range(0,10).Select(x=> new Toto{Id=x, Label= "Label_"+(x+1), Order = 100-x}).ToList();        

        Console.WriteLine("Donnée Source :"); data.Dump();      

​

        var filter_0 = data.FindAll(x=> x.Label.Contains("List Vide");

        Console.WriteLine("\nList Vide :"); filter_0.Dump();

​

        var pouf= filter_0.OrderByDescending(x=> x.Order).FirstOrDefault();

​

        if(pouf is Toto safe){      

            Console.WriteLine("\nWill never goes boom :"); safe.Dump();

        }

​

        Console.WriteLine("\nCause it's a pouf  :"); pouf.Dump();

    }

    public class Toto{

        public int Id{get;set;}

        public string Label{get;set;}

        public int Order{get;set;}

    }

}