private void btn3_restock_Click(object sender, EventArgs e) { try { //Restock any item that you'd like int item = dataGridView_inventory.CurrentCell.RowIndex; int amount = int.Parse(textBox10_restockAmount.Text); Product restockItem = IM.getItemList()[item]; IM.restockItem(amount, restockItem); dataGridView_inventory.DataSource = IM.getItemList(); } catch(Exception ex) { MessageBox.Show("Please be sure to enter a number."); } }