public string Add(Product aProduct)
{
foreach (Product newProduct in Products)
{
if (newProduct.ID == aProduct.ID)
{
newProduct.Quantity += aProduct.Quantity;
return "Successfully Added.";
}
}
Products.Add(aProduct);
return "New Iteam Added.";
}
private void addIteamButton_Click(object sender, EventArgs e)
{
Product aProduct = new Product(productTextBox.Text, Convert.ToInt16(quantityTextBox.Text));
string msg = aShop.Add(aProduct);
MessageBox.Show(msg);
}