private void btn_SaleItem_Click(object sender, EventArgs e)
        {
            frmSaleItem frmSale = new frmSaleItem();

            frmSale.ShowDialog();
            lblTotalPrice.Text = ConfigurationDAL.GetCurrentCurrency() + frmSale.getSaleTotalPrice();
            this.subTotal      = frmSale.getSaleTotalPrice();
            if (this.subTotal > 0)
            {
                btnPaid.Enabled                = true;
                txtMoneyPaid.Enabled           = true;
                picStatusPayment.Image         = global::Shop_Management_Solution.Properties.Resources.recieve_cash;
                lblPaymentStatusText.Text      = "Recieve Cash";
                lblPaymentStatusText.ForeColor = Color.Green;
            }
        }
        private void saleItemToolStripMenuItem_Click(object sender, EventArgs e)
        {
            frmSaleItem frmSale = new frmSaleItem();

            frmSale.ShowDialog();
        }