using System;

using System.Collections.Generic;

using System.Linq;

public class Program

{

    public static void Main()

    {

        List<Test> lstTest = new List<Test>();

            lstTest.Add(new Test { dt = new DateTime(2017, 1, 2), amount = 2500 });

            lstTest.Add(new Test { dt = new DateTime(2017, 1, 2), amount = 10000 });

            lstTest.Add(new Test { dt = new DateTime(2017, 1, 5), amount = 4000 });

            lstTest.Add(new Test { dt = new DateTime(2017, 1, 10), amount = 40000 });

            lstTest.Add(new Test { dt = new DateTime(2017, 1, 15), amount = 2000 });

            lstTest.Add(new Test { dt = new DateTime(2017, 1, 25), amount = 12000 });

            lstTest.Add(new Test { dt = new DateTime(2017, 2, 5), amount = 38000 });

            lstTest.Add(new Test { dt = new DateTime(2017, 2, 10), amount = 38000 });

            lstTest.Add(new Test { dt = new DateTime(2017, 2, 15), amount = 4000 });

            lstTest.Add(new Test { dt = new DateTime(2017, 2, 20), amount = 2000 });

            lstTest.Add(new Test { dt = new DateTime(2017, 2, 20), amount = 20000 });

            lstTest.Add(new Test { dt = new DateTime(2017, 3, 15), amount = 2000 });

            lstTest.Add(new Test { dt = new DateTime(2017, 3, 20), amount = 2000 });

            lstTest.Add(new Test { dt = new DateTime(2017, 3, 20), amount = 4000 });

            lstTest.Add(new Test { dt = new DateTime(2017, 3, 31), amount = 1000 });

            lstTest.Add(new Test { dt = new DateTime(2017, 4, 9), amount = 50000 });

            lstTest.Add(new Test { dt = new DateTime(2017, 4, 11), amount = 2000 });

            lstTest.Add(new Test { dt = new DateTime(2017, 4, 21), amount = 1000 });

            lstTest.Add(new Test { dt = new DateTime(2017, 4, 21), amount = 10000 });

            lstTest.Add(new Test { dt = new DateTime(2017, 4, 28), amount = 5000 });

            lstTest.Add(new Test { dt = new DateTime(2017, 5, 5), amount = 45000 });

            lstTest.Add(new Test { dt = new DateTime(2017, 5, 7), amount = 98000 });

            lstTest.Add(new Test { dt = new DateTime(2017, 5, 9), amount = 7000 });

            lstTest.Add(new Test { dt = new DateTime(2017, 5, 25), amount = 2000 });

            lstTest.Add(new Test { dt = new DateTime(2017, 5, 31), amount = 1000 });

​

            var result = lstTest.Select(x => new

            {

                Amount = x.amount,

                Date = x.dt,

                MonthDiff = GetMonthsDiff(DateTime.Now, x.dt),

                Quater = GetQuarter(DateTime.Now, x.dt)

            }).OrderBy(o=>o.Quater).ThenByDescending(o=>o.Amount);

​

            foreach (var res in result)

            {

                Console.WriteLine("Amount = {0}  Date= {1} MonthDiff= {2}  Quater= {3}", res.Amount, res.Date, res.MonthDiff, res.Quater);

            }

        Console.WriteLine("Hello World");

    }

     public static string GetQuarter(DateTime start, DateTime end)// int month)

        {

            int month = GetMonthsDiff(start, end);

            string quarter =  month <= 3 ? "Q1" : (month >= 4 && month <= 6) ? "Q2" : (month >= 7 && month <= 9) ? "Q3" : "Q4";

            return quarter;

        }

​

​

​

        public static int GetMonthsDiff(DateTime start, DateTime end)

        {

            if (start > end)

                return GetMonthsDiff(end, start);

​

            int months = 0;

            do

            {

                start = start.AddMonths(1);

                if (start > end)

                    return months;

​

                months++;

            }

            while (true);

        }

    public class Test

    {

        public DateTime dt { get; set; }

        public int amount { get; set; }

    }

}