using System;

using System.Linq;                  

public class Program

{

    public static void Main()

    {

        var a = new int[] {5,1,3,2,1};

        Console.WriteLine(a.OrderByDescending(x=>x).Skip(1).SingleOrDefault(y=>y == 0));

    }

    public void ReturnObject()

    {

    }

}

​

public class TestClass

{

    public int a {get;set;}

}