} //O(1)
private void deleteAllOrders(ref LinkedList <Order> orders, DBhandler DBUse) //deletes all orders from DB
{
while (orders.Count != 0)
{
DBUse.deleteOrder(orders.ElementAt(0).getOrderID());
orders.RemoveFirst();
}
} //O(N)
} //O(1)
private void orderBtnDel_Click(object sender, EventArgs e)
{
orderStatusMsglbl.Text = "";
DBhandler DBUse = new DBhandler();
int product = 0;
orderStatusMsglbl.Text += orderIDtxt.Text.Trim().Length == 0 ? "Missing Order ID.\n" : "";
orderStatusMsglbl.Text += !int.TryParse(orderIDtxt.Text, out product) && orderIDtxt.Text.Trim().Length != 0 ? "Not a number for Order ID.\n" : "";
if (orderStatusMsglbl.Text.Length == 0)
{
DBUse.deleteOrder(product);
fillOrders();
}
ordersClearTxt();
DBUse = null;
} //O(1)