Found many section of times intersect (can edit), C#

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//Rextester.Program.Main is the entry point for your code. Don't change it.
//Compiler version 4.0.30319.17929 for Microsoft (R) .NET Framework 4.5

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

namespace Rextester
{
    public class Program
    {
        class TimeRange
        {
            public DateTime Start{get;set;} 
            public DateTime End{get;set;} 
            public string Status{get;set;}
        }
        
        public static void Main(string[] args)
        {
            //Your code goes here
            Console.WriteLine("HoaND:_");
            var provider = new CultureInfo("de-DE");
            //var d = DateTime.ParseExact("08.05.2016", "d", provider);
            //Console.WriteLine(d);
            
            /*
            *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
            */
            
            /*
            var list = new List<TimeRange>{
                new TimeRange{
                    Start = DateTime.ParseExact("08.05.2016", "d", provider),
                    End = DateTime.ParseExact("20.05.2016", "d", provider),
                    Status = ""
                },
                new TimeRange{
                    Start = DateTime.ParseExact("17.05.2016", "d", provider),
                    End = DateTime.ParseExact("25.05.2016", "d", provider),
                    Status = ""
                },
                new TimeRange{
                    Start = DateTime.ParseExact("27.05.2016", "d", provider),
                    End = DateTime.ParseExact("28.05.2016", "d", provider),
                    Status = ""
                }
            };
            */
            
            var list = new List<TimeRange>{
                new TimeRange{
                    Start = DateTime.ParseExact("05.05.2016", "d", provider),
                    End = DateTime.ParseExact("07.05.2016", "d", provider),
                    Status = ""
                },
                new TimeRange{
                    Start = DateTime.ParseExact("15.05.2016", "d", provider),
                    End = DateTime.ParseExact("20.05.2016", "d", provider),
                    Status = ""
                },
                new TimeRange{
                    Start = DateTime.ParseExact("22.05.2016", "d", provider),
                    End = DateTime.ParseExact("25.05.2016", "d", provider),
                    Status = ""
                }
            };
            
            Console.WriteLine("=> Input: ");
            
            foreach(var item in list){
                Console.WriteLine(item.Start +" -> "+ item.End);
            }
            
            //Logic here
            //TODO: code
            ///*
            
            var lst =  new List<DateTime>();
            foreach(var item in list){
                lst.Add(item.Start);
                lst.Add(item.End);
            }
            
            lst = lst.OrderBy(t=>t).ToList();
            
            var rs = new List<TimeRange>();
            
            
            for(var i = 1; i< lst.Count; i++){
                var temp = new TimeRange{Start = lst[i-1], End = lst[i]};
                var tb = temp.Start.AddDays(1);
                
                switch(list.Where(t=> (tb > t.Start.Date && tb <= t.End.Date)).Count())
                {
                    case 0:
                        temp.Status = "blank";
                    break;
                    case 1:
                        temp.Status = "normal";
                    break;
                    default:
                        temp.Status = "over";
                    break;
                    
                }
                
                rs.Add(temp);                           
                
                Console.WriteLine("start: " + temp.Start.ToShortDateString() + ", end: " + temp.End.ToShortDateString() + ", status: " + temp.Status);
            }
            
            //*/
            
            //Case 1: pick tat ca cac khoang ko giao nhau
            //var listKoGiaoNhau = list.Where(x=>list.Find(t=>(t.Start >= x.Start && t.End <= x.End)
            //                                            || (t.Start )))
        }
    }       
}

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Compilation time: 0,14 sec, absolute running time: 0,13 sec, cpu time: 0,08 sec, average memory usage: 18 Mb, average nr of threads: 3