using System;

using System.Linq;

using System.Collections.Generic;

​

public class Program

{

    public class User

    {

        public int UserId {get;set;}

        public DateTime Start {get;set;}

        public DateTime End {get;set;}

    }

    public static void Main()

    {

        var Users = new List<User>();

        Users.Add(new User(){UserId = 1, Start = new DateTime(2014,1,1), End = new DateTime(2016,12,1)}); 

        Users.Add(new User(){UserId = 2, Start = new DateTime(2017,01,06), End = new DateTime(2018,01,06)}); 

        Users.Add(new User(){UserId = 3, Start = new DateTime(2016,01,08), End = new DateTime(2018,01,06)}); 

        Users.Add(new User(){UserId = 4, Start = new DateTime(2014,01,08), End = new DateTime(2016,01,06)}); 

​

        var id = 1;

        var result = (

            from c in Users

            where c.UserId == id

            select c).Single();

​

        TimeSpan span = result.End - result.Start;

        int Years = (int)span.Days/365;

​

        Console.WriteLine(String.Format("{0} - {1} = {2}", result.End.ToShortDateString(), result.Start.ToShortDateString(),Years));

        if (Years < 2)

        {

          Console.WriteLine("Logic Ran");

        }

    }

}