using System;

using System.Collections.Generic;       

using System.Linq;

public class Program

{

    public static void Main()

    {

        List<MGGoogleCampaignReport> data = new List<MGGoogleCampaignReport>();

        for(int i=0;i<10;i++){

            var item = new MGGoogleCampaignReport();

            item.AdwordId = i.ToString();

            item.Cost= i==3? i-1:i ;

            item.StartDate = DateTime.Now.AddDays(-i);

            Console.WriteLine("{0}, {1}", item.Cost , item.StartDate);

            data.Add(item);

        }

        var firstCost =data.Where(x=> x.StartDate.HasValue && x.Cost > 0)

            .OrderBy(x=>x.Cost).ThenBy(x=>x.StartDate)

            .FirstOrDefault(x=> x.AdwordId == "2");

        Console.WriteLine(firstCost.StartDate);

    }

    public class MGGoogleCampaignReport

    {

        //public ObjectId Id { get; set; }

        public string AdwordId { get; set; }

        public double Cost { get; set; }

        public DateTime? StartDate { get; set; }

    }

}