Found many section of times intersect (Question version), C#

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//Rextester.Program.Main is the entry point for your code. Don't change it.
//Microsoft (R) Visual C# Compiler version 2.9.0.63208 (958f2354)

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;
using System.Globalization;

namespace Rextester
{
    class TimeRange
    {
        public DateTime Start{get;set;} 
        public DateTime? End{get;set;} 
        public string Status{get;set;}
    }
    
    public class Program
    {
        public static void Main(string[] args)
        {
            Console.WriteLine("HoaND:_");
            var provider = new CultureInfo("de-DE");
            // Result store here
            var rs = new List<TimeRange>();
            //Init template data
            var list = new List<TimeRange>{
                new TimeRange{
                    Start = DateTime.ParseExact("08.05.2016", "d", provider),
                    End = DateTime.ParseExact("20.05.2016", "d", provider),
                    //End = null, //=> i can input END time is Null
                    Status = ""
                },
                
                new TimeRange{
                    Start = DateTime.ParseExact("17.05.2016", "d", provider),
                    End = DateTime.ParseExact("25.05.2016", "d", provider),
                    //End = null, //=> i can input END time is Null
                    Status = ""
                },
                new TimeRange{
                    Start = DateTime.ParseExact("27.05.2016", "d", provider),                    
                    End = DateTime.ParseExact("28.05.2016", "d", provider),
                    //End = null, //=> i can input END time is Null
                    Status = ""
                }
                
            };
            //Your code goes here
            //TODO:
            
            //Print results
            foreach(var item in rs){                
                Console.WriteLine(string.Format("{0} -> {1},Status={2}",
                    item.Start.ToShortDateString(),
                    item.End != null ? item.End.Value.ToShortDateString() : "NULL",
                    item.Status
                   ));
            }
            
            /*
            *Requirement*
            Test 1:
            => input (dd.mm.yyyy):
            t1 = 08.05.2016 -> 20.05.2016
            t2 = 17.05.2016 -> 25.05.2016
            t3 = 27.05.2016 -> 28.05.2016
            => output:
            t1 = 08.05.2016 -> 17.05.2016, Status = normal
            t2 = 17.05.2016 -> 20.05.2016, Status = overlap
            t3 = 20.05.2016 -> 25.05.2016, Status = normal
            t4 = 27.05.2016 -> 28.05.2016, Status = normal
            
            Test 2:
            => input:
            t1 = 05.05.2016 -> 20.05.2016
            t2 = 07.05.2016 -> 15.05.2016
            t3 = 17.05.2016 -> 25.05.2016
            => output:
            t1 = 05.05.2016 -> 07.05.2016, Status = normal
            t2 = 07.05.2016 -> 15.05.2016, Status = overlap
            t3 = 15.05.2016 -> 17.05.2016, Status = normal
            t4 = 17.05.2016 -> 20.05.2016, Status = overlap
            t5 = 20.05.2016 -> 25.05.2016, Status = normal
            
            Test3:
            => input:
            t1 = 05.05.2016 -> 07.05.2016
            t2 = 15.05.2016 -> 20.05.2016
            t3 = 22.05.2016 -> 25.05.2016
            => output:
            t1 = 05.05.2016 -> 07.05.2016, Status = normal
            t2 = 15.05.2016 -> 20.05.2016, Status = normal
            t3 = 22.05.2016 -> 25.05.2016, Status = normal
            
            Test4:
            => Input: 
            t1 = 08.05.2016 -> 20.05.2016
            t2 = 17.05.2016 -> NULL
            => Output: 
            t1 = 08.05.2016 -> 16.05.2016,Status=normal
            t2 = 17.05.2016 -> 20.05.2016,Status=overlap
            t3 = 20.05.2016 -> NULL,Status=normal
            
            Test5:
            => Input: 
            t1 = 08.05.2016 -> NULL
            t2 = 17.05.2016 -> NULL
            => Output: 
            t1 = 08.05.2016 -> 16.05.2016,Status=normal
            t2 = 17.05.2016 -> NULL,Status=overlap
            */
        }
    }
}

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