using System;

using System.Linq;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        List<Access> lst = new List<Access>();

        //add 2 duplicate records

        lst.Add(new Access(){id=1,enabled=true} );      

        lst.Add(new Access(){id=1,enabled=true} );

        lst.Add(new Access(){id=1,enabled=false} );

        lst.Add(new Access(){id=2,enabled=false} );

        lst.Add(new Access(){id=2,enabled=false} );

        Dictionary<int,Boolean> newList = lst.GroupBy(x=>x.id).Select(x=>x.First()).ToDictionary(r => r.id, k => k.enabled);

        /*** If ToDictionary is called without GroupBy, then run time error will occur.***/

        //lst.ToDictionary(r => r.id, k => k.enabled);[System.ArgumentException: An item with the same key has already been added.]

        Console.WriteLine(newList.Count()); //should print 2

        Console.WriteLine(newList[2]);

    }

    public class Access{

        public int id{get;set;}

        public Boolean enabled{get;set;}

    }

}