public List <String> ConstructionsToCmb(string dataObjects)
        {
            List <Constructions> constructions = JsonConvert.DeserializeObject <List <Constructions> >(dataObjects);
            List <String>        listek        = new List <String>();

            for (int x = 0; x < constructions.Count; x++)
            {
                Constructions a = constructions[x];

                listek.Add(a.site_name);
            }

            return(listek);
        }
        public string getConstructionsId(string dataObjects, string site_name)
        {
            List <Constructions> constructions = JsonConvert.DeserializeObject <List <Constructions> >(dataObjects);

            for (int x = 0; x < constructions.Count; x++)
            {
                Constructions a = constructions[x];
                if (a.site_name == site_name)
                {
                    return(a._id);
                }
            }

            return("");
        }
        public async void insertConstruction(string location, string site_name, Boolean used)
        {
            var construction = new Constructions();

            construction.location  = location;
            construction.site_name = site_name;
            construction.used      = used;

            var json = JsonConvert.SerializeObject(construction);
            var data = new StringContent(json, Encoding.UTF8, "application/json");

            var url    = $"https://attendance-diary.herokuapp.com/diary/constructions";
            var client = new HttpClient();

            var response = await client.PostAsync(url, data);

            string result = response.Content.ReadAsStringAsync().Result;

            Console.WriteLine(result);
        }