private void buttonAddToList_Click(object sender, EventArgs e)
{
Order order = new Order();
if (OrderValidation.isValidID(textboxOrderId) && OrderValidation.isValidClient(textboxClientId) && OrderValidation.isValidBooks(textboxBookId) && OrderValidation.isValidValues(textboxbQuantity))
{
order.OrderID = Convert.ToInt32(textboxOrderId.Text);
order.ClientID = Convert.ToInt32(textboxClientId.Text);
order.BookID = Convert.ToInt64(textboxBookId.Text);
order.Quantity = Convert.ToInt32(textboxbQuantity.Text);
OrderDA.Add(order);
ClearAll();
}
}
