static void Main(string[] args)

{

    var list1 = Enumerable.Range(0, (int)Math.Pow(2, 22)).ToList();

    var list2 = new List<int>(list1);

    list2.Add(1);

    Console.WriteLine($"list1.Capacity={list1.Capacity}");

    Console.WriteLine($"list2.Capacity={list2.Capacity}");

    Console.ReadLine();

}

public static IEnumerable<int> Range(int start, int count)

{

      long num = (long) start + (long) count - 1L;

      if (count < 0 || num > (long) int.MaxValue)

        throw Error.ArgumentOutOfRange("count");

      else

        return Enumerable.RangeIterator(start, count);

}

private static IEnumerable<int> RangeIterator(int start, int count)

{

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

        yield return start + i;

}

// implementation

public static System.Collections.Generic.IEnumerable<DateTime> DateRange(DateTime begin, DateTime end)

{

      for (var iterator = begin; iterator <= end; iterator = iterator.AddDays(1))

       {

            yield return iterator;

       }

}

// usage

foreach (var date in DateRange(DateTime.Now.Date,DateTime.Now.Date.AddDays(5).AddHours(3)))

{

        Console.WriteLine(date.ToLocalTime());

}