public void Update(YoneticiDAL yonetici)
 {
     try
     {
         ParseYoneticiFile();
         var result = YoneticiList.Where(x => x.Id == yonetici.Id).FirstOrDefault();
         YoneticiList.Remove(result);
         YoneticiList.Add(yonetici);
         using (StreamWriter sw = File.CreateText(@"C:\Users\Yasin\Documents\GitHub\proje2-yetisyagauss\proje2-yetisyagauss\DeuCSC.Proje2.DAL\Data\Odalar.txt"))
         {
             sw.Flush();
             JsonSerializer serializer = new JsonSerializer();
             serializer.Serialize(sw, YoneticiList);
         }
     }
     catch (Exception e)
     {
         Console.WriteLine(e);
     }
 }
        public void Add(YoneticiDAL yonetici)
        {
            try
            {
                ParseYoneticiFile();
                if (YoneticiList == null)
                {
                    YoneticiList = new List <YoneticiDAL>();
                }

                YoneticiList.Add(yonetici);
                using (StreamWriter sw = File.CreateText(@"C:\Users\Yasin\Documents\GitHub\proje2-yetisyagauss\proje2-yetisyagauss\DeuCSC.Proje2.DAL\Data\Odalar.txt"))
                {
                    sw.Flush();
                    JsonSerializer serializer = new JsonSerializer();
                    serializer.Serialize(sw, YoneticiList);
                }
            }
            catch (Exception e)
            {
                Console.WriteLine(e);
            }
        }