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("03.05.2016", "d", provider),
                    End = DateTime.ParseExact("10.05.2016", "d", provider),
                    Status = ""
                },
                new TimeRange{
                    Start = DateTime.ParseExact("05.05.2016", "d", provider),
                    End = DateTime.ParseExact("05.05.2016", "d", provider),
                    Status = ""
                },
                new TimeRange{
                    Start = DateTime.ParseExact("01.05.2016", "d", provider),
                    End = DateTime.ParseExact("06.05.2016", "d", provider),
                    Status = ""
                }
            };
            
            Console.WriteLine("=> Input: ");            
            foreach(var item in list){
                Console.WriteLine(item.Start +" -> "+ item.End);
            }           
            
            //Logic here            
            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 rs1 = 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((temp.Start.Date == temp.End.Date ? 0: 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 = "overlap";
                    break;
                    
                }
                
                rs1.Add(temp);                                           
            }            
            
            rs1.RemoveAll(x=>x.Status == "blank");
            var rs2 = new List<TimeRange>();
            rs1.ForEach(x=>{
                if(rs2.Find(t=>t.Start == x.Start && t.End == x.End) == null){
                    rs2.Add(x);
                }
            });
            rs2.RemoveAll(x=>x.Start == x.End && (rs2.Find(t=>t.Start != t.End && (t.Start == x.Start || t.End == x.End) && t.Status == x.Status) != null));
            
            /*
            var rs3 = new List<TimeRange>();
            var rstmp = new List<TimeRange>();
            
            //Clone to rstmp
            foreach(var item in rs2){
                rstmp.Add(new TimeRange{
                    Start = item.Start,
                    End = item.End,
                    Status = item.Status
                });
            }
            
            if(rs2.Count == 1){
                rs3 = rs2;
            }else{
                var flag = false;
                var tmp = new TimeRange();
                
                rs2.ForEach(x=>{
                    rstmp.RemoveAll(t=>t.Start.Date == x.Start.Date && t.End.Date == x.End.Date && t.Status == x.Status);
                    
                    if(!flag)
                    {
                        tmp = x;
                        flag = true;
                    }
                    else{
                        tmp.End = x.End;                        
                    }                                                           
                    var item = rstmp.Find(t=>t.Start.Date == x.End.Date && t.Status == x.Status);
                    if(item != null){
                        tmp.End = item.End;                    
                    }else{
                       rs3.Add(tmp); 
                       flag = false;
                    }
                    
                    
                    
                });
            }
            
            */
                        
            Console.WriteLine("=> Output: ");
            foreach(var item in rs2){
                Console.WriteLine(item.Start +" -> "+ item.End + ",Status= "+ item.Status);
            }
        }
    }       
}

Show compiler warnings [ + ] Show input
Compilation time: 0,14 sec, absolute running time: 0,11 sec, cpu time: 0,11 sec, average memory usage: 15 Mb, average nr of threads: 3