using System;

using System.Linq;

​

public class Program

{

    public static void Main()

    {

        var endDate = DateTime.Now;

        var startDate = endDate.AddDays(-3);

          for (var i = 0; i < (endDate - startDate).TotalDays; i++)

          {

              Console.WriteLine("iteration");

          }

          foreach(var i in Enumerable.Range(0, (int)(endDate - startDate).TotalDays))

          {

              Console.WriteLine("iteration");

          }

    }

}