private static void Save <TModel>(IEnumerable <TModel> models, string nameOfModelCollection)
 {
     XmlDataAccess.Save(models.ToArray(), RoomForRentXmlConfig.GetFilePath(nameOfModelCollection));
     SetRelationalProperties();
 }
        // ReSharper disable once RedundantAssignment
        private static void Load <TModel>(ref IList <TModel> models, string nameOfModelCollection)
        {
            var loadResult = XmlDataAccess.Load <TModel[]>(RoomForRentXmlConfig.GetFilePath(nameOfModelCollection));

            models = loadResult?.ToList() ?? new List <TModel>();
        }