private void Btn_Add_Click(object sender, EventArgs e)
        {
            AddEditSalesRecord AddRecord = new AddEditSalesRecord(true);

            AddRecord.FormClosing += new FormClosingEventHandler(SalesRecords_FormClosing);
            AddRecord.ShowDialog();  // Shows the Add Sakes page
        }
        private void Btn_Edit_Click(object sender, EventArgs e)
        {
            DataGridViewRow row = dataGridView_salesRecords.CurrentCell.OwningRow;

            id     = row.Cells["Sales ID"].Value.ToString();
            date   = row.Cells["Sales Date"].Value.ToString();
            tPrice = row.Cells["Sales Total Price"].Value.ToString();

            AddEditSalesRecord EditRecord = new AddEditSalesRecord(false, id, date, tPrice);

            EditRecord.FormClosing += new FormClosingEventHandler(SalesRecords_FormClosing);
            EditRecord.ShowDialog();  // Shows the Edit sales page
        }