private void button1_Click(object sender, EventArgs e)
        {
            GeneralSales GeneralSales = new GeneralSales();

            switch (ComboBoxGeneralSalesDemandSorter.SelectedItem.ToString())
            {
            case "Ascending":
                DataGridViewgeneralSales.DataSource = GeneralSales.GetItemDemand("Ascending");
                break;

            case "Descending":
                DataGridViewgeneralSales.DataSource = GeneralSales.GetItemDemand("Descending");
                break;
            }
        }
        private void ButtonGeneralSalesShow1_Click(object sender, EventArgs e)
        {
            GeneralSales GeneralSales = new GeneralSales();

            if (GeneralSales.BasicStatistics(GeneralSales.GetStartDate(ComboBoxGeneralSalesPeriod.SelectedItem.ToString()),
                                             GeneralSales.GetEndDate()) == true)
            {
                //LabelTotalSalesValue.Text = GeneralSales.GetTotalSales().ToString();    /////////
                LabelTotalOrdersValue.Text    = GeneralSales.GetTotalOrders().ToString();
                LabelTotalUnitsSoldValue.Text = GeneralSales.GetTotalUnitsSold().ToString();
            }
            else
            {
                //Error handling not required.
            }
        }