private DataTable GetItemMonth()
        {
            var dbCon = DBConnection.Instance();

            dbCon.IsConnect();
            MySqlCommand cmd = new MySqlCommand();

            cmd.Connection  = dbCon.Connection;
            cmd.CommandType = CommandType.Text;

            cmd.CommandText = "SELECT        itemName, SUM(TOTAL_DISCOUNTED_ITEM) AS Expr1 FROM sales_report_item_view WHERE(MONTHNAME(_date) = '" + ((ComboBoxItem)ComboBoxMonth.SelectedItem).Content.ToString() + "') GROUP BY itemName  ";
            DatasetReportSales.SalesItemDataTable dSItem = new DatasetReportSales.SalesItemDataTable();

            MySqlDataAdapter mySqlDa = new MySqlDataAdapter(cmd);

            mySqlDa.Fill(dSItem);

            return(dSItem);
        }
        private DataTable GetItem()
        {
            var dbCon = DBConnection.Instance();

            dbCon.IsConnect();
            MySqlCommand cmd = new MySqlCommand();

            cmd.Connection  = dbCon.Connection;
            cmd.CommandType = CommandType.Text;

            cmd.CommandText = "SELECT        itemName, SUM(TOTAL_DISCOUNTED_ITEM) AS Expr1 FROM sales_report_item_view GROUP BY itemName";

            DatasetReportSales.SalesItemDataTable dSItem = new DatasetReportSales.SalesItemDataTable();

            MySqlDataAdapter mySqlDa = new MySqlDataAdapter(cmd);

            mySqlDa.Fill(dSItem);

            return(dSItem);
        }
        private DataTable GetItemRange()
        {
            var dbCon = DBConnection.Instance();

            dbCon.IsConnect();
            MySqlCommand cmd = new MySqlCommand();

            cmd.Connection  = dbCon.Connection;
            cmd.CommandType = CommandType.Text;

            cmd.CommandText = "SELECT        itemName, SUM(TOTAL_DISCOUNTED_ITEM) AS Expr1 FROM sales_report_item_view WHERE(_date BETWEEN '" + DateStart.SelectedDate.Value.ToString("yyyy-MM-dd") + "' AND '" + DateEnd.SelectedDate.Value.ToString("yyyy-MM-dd") + "') GROUP BY itemName  ";

            DatasetReportSales.SalesItemDataTable dSItem = new DatasetReportSales.SalesItemDataTable();

            MySqlDataAdapter mySqlDa = new MySqlDataAdapter(cmd);

            mySqlDa.Fill(dSItem);

            return(dSItem);
        }