using System;

using System.Collections.Generic;                   

public class Program

{

    public enum TimeRange

    {

        Today,

        Yesterday,

        Lastweek,

        lastmonth,

        Last7days,

        Last30days,

        LastYear,

    }

    public static void Main()

    {

        GetRecord1(TimeRange.Yesterday);

    }

     private static void GetRecord1(TimeRange timeRange)

        {           

​

            var dateFrom = DateTime.Today;

            var dateTo = DateTime.Today; ;

            switch (timeRange)

            {

                case TimeRange.Today:

                    break;

                case TimeRange.Yesterday:

                    dateFrom = dateFrom.AddDays(-1);

                    dateTo = dateTo.AddSeconds(-1);

                     Console.WriteLine("dateFrom :"+dateFrom);

                 Console.WriteLine("dateTo :"+dateTo);

                    break;

                case TimeRange.Lastweek:

                    var thisWeekStart = dateFrom.AddDays(-(int)dateFrom.DayOfWeek);

                    var thisWeekEnd = thisWeekStart.AddDays(7).AddSeconds(-1);

                    dateFrom = thisWeekStart.AddDays(-7);

                    dateTo = thisWeekStart.AddSeconds(-1);

                    break;

                case TimeRange.lastmonth:

                    var thisMonthStart = dateFrom.AddDays(1 - dateFrom.Day);

                    var thisMonthEnd = thisMonthStart.AddMonths(1).AddSeconds(-1);

                    dateFrom = thisMonthStart.AddMonths(-1);

                    dateTo = thisMonthStart.AddSeconds(-1);

                    break;

                case TimeRange.Last7days:

                    dateFrom = dateFrom.AddDays(-7);

                    break;

                case TimeRange.Last30days:

                    dateFrom = dateFrom.AddDays(-30);

                    break;

                case TimeRange.LastYear:

                    var year = dateFrom.Year;

                    dateFrom = new DateTime(year - 1, 1, 1);

                    dateTo = new DateTime(year - 1, 12, 31);

                    break;

            }

​

        }

}