using System;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        var item = new List<Item>

        {

            new Item {StartDate = DateTime.Now, EndDate = DateTime.Now.AddDays(2)},

            new Item {StartDate = DateTime.Now, EndDate = DateTime.Now.AddMinutes(120)}

        };

        foreach (var i in item)

        {

            Console.WriteLine(i.ToString());

        }            

        Console.ReadLine();

    }

    public class Item

    {

        public DateTime StartDate { get; set; }

        public DateTime EndDate { get; set; }

​

        public override string ToString()

        {

            var endDateStr = StartDate.Date != EndDate.Date 

                ? Environment.NewLine + EndDate.ToShortDateString() 

                : string.Empty;

            return string.Format("{0}{1}", StartDate.ToShortDateString(), endDateStr);

        }

    }

}