}         // LoadProductParameters()

        public static void LoadStoreGrades(DataTable table)
        {
            var storeGradeList = table.AsEnumerable().Select(Row => new StoreGrade
            {
                StoreNumber = Convert.ToInt16(Row.Field <string>("StoreNumber")),
                Group       = StringToEnumConverter.StringNumToGroup(Row.Field <string>("Group")),
                Grade       = StringToEnumConverter.StringNumToStoreGrade(Row.Field <string>("Grade"))
            }).ToList();

            MainWindowViewModel.Context.StoresGrades.AddRange(storeGradeList);
            MainWindowViewModel.SaveContext();
        }         // LoadStoreGrades()
        }         // LoadProduct()

        /// <summary>
        /// Load product parameters from table to database.
        /// </summary>
        public static void LoadProductParameters(DataTable table)
        {
            var parameterList = table.AsEnumerable().Select(Row => new ProductParameters
            {
                PLU   = Convert.ToInt32(Row.Field <string>("PLU")),
                Grade = StringToEnumConverter.StringNumToStoreGrade(Row.Field <string>("Grade")),
                Min   = Convert.ToInt16(Row.Field <string>("Min")),
                Max   = Convert.ToInt16(Row.Field <string>("Max")),
                Cover = Convert.ToInt16(Row.Field <string>("Cover"))
            }).ToList();

            MainWindowViewModel.Context.ProductParameters.AddRange(parameterList);
            MainWindowViewModel.SaveContext();
        }         // LoadProductParameters()