Generate date range in 6 months slot

class Program

    {

        static void Main(string[] args)

        { 

            var startDate = "01/01/2011";

            var endDate = DateTime.Now.ToString("MM/dd/yyyy");



            var res = GetDateRange(Convert.ToDateTime(startDate), Convert.ToDateTime(endDate));





            foreach (KeyValuePair<DateTime, DateTime> pair in res)

            {

                Console.WriteLine("StartDate = {0} , EndDate = {1}", pair.Key, pair.Value);

            }

                Console.ReadKey(); 

        }



        public static Dictionary<DateTime, DateTime> GetDateRange(DateTime startDate, DateTime endDate)

        {

            Dictionary<DateTime, DateTime> record = new Dictionary<DateTime,DateTime>();

            int months = 6;

            //case 1 if start date and end date diff less than 6 months

            var res = MonthDifference(Convert.ToDateTime(endDate), Convert.ToDateTime(startDate));

            if (res <= months)

            {

                record.Add(startDate, endDate);

            }

            //when date diff is greater than 6 months

            else

            {

                var mod = res % months;

                int counter = res % months == 0 ? (res / months) : (res / months) + 1;

                int incr = 0;



                for (int i = 0; i < counter; i++)

                {

                    incr++;                  



                                       

                    if (incr != counter)

                    {

                        record.Add(startDate, startDate.AddMonths(months));

                        startDate = startDate.AddMonths(months).AddDays(1);

                    }



                    if (incr == counter)

                    {

                        record.Add(startDate, endDate);

                    }

                        

                }

            }

            return record;           

        }



        public static int MonthDifference(DateTime lValue, DateTime rValue)

        {

            return (lValue.Month - rValue.Month) + 12 * (lValue.Year - rValue.Year);

        }



    }