C#.NET - Get first day and Last day of Month

  public DateTime FirstDayOfMonthFromDateTime(DateTime dateTime)

        {

            return new DateTime(dateTime.Year, dateTime.Month, 1);

        }

        public DateTime LastDayOfMonthFromDateTime(DateTime dateTime)

        {

            DateTime firstDayOfTheMonth = new DateTime(dateTime.Year, dateTime.Month, 1);

            return firstDayOfTheMonth.AddMonths(1).AddDays(-1);

        }