private void btn_Ok_Click(object sender, EventArgs e) { CurrentTransaction_DB cTR = new CurrentTransaction_DB(); int price = cTR.getprice(cBox_Item.Text); int paid = price * (Convert.ToInt32(cBox_Quantity.Text)); cTR.Item = cBox_Item.Text; cTR.Quantity = cBox_Quantity.Text; cTR.Price = price.ToString(); cTR.PayPrice = paid.ToString(); cTR.addtransaction(cTR); // dataGridView1.AutoGenerateColumns = true; //cTR.FillGrid(dataGridView1); sum = sum + paid; lbl_ShowBill.Text = sum.ToString(); }