protected void btnAddtoCart_Click(object sender, EventArgs e)
{
int quantitySelected = 0;
try{
quantitySelected = Convert.ToInt16(txtQuantity.Text);
if (Page.IsValid)
{
Cake selectedProduct = this.GetSelectedProduct();
CartItemList cart = CartItemList.GetCart();
CartItem cartItem = cart[selectedProduct.ProductId];
int index = 0;
int alreadyInCart = 0;
if (cart.Count > 0)
{
while (index != -1)
{
if (cart.GetProdID(index) == selectedProduct.ProductId)
{
alreadyInCart = cart.GetQuantity(index);
}
index = cart.IndexAdvance(index);
}
}
// checking first to see if we have the amount selected currently on hand
if (quantitySelected + alreadyInCart <= selectedProduct.OnHand)
{
if (quantitySelected > 0)
{
// if we do, then we can add to cart and redirect to cart
//if item isn't in cart, add it; otherwise, increase its quantity
if (cartItem == null)
{
cart.AddItem(selectedProduct, Convert.ToInt32(txtQuantity.Text));
}
else
{
cartItem.AddQuantity(Convert.ToInt32(txtQuantity.Text));
}
Response.Redirect("~/Cart/Cart.aspx");
}
else
{
lblQuan.Text = "Please enter a quantity greater than zero.";
}
}
else
{
//ask them to order fewer
lblQuan.Text = "Sorry, we do not have that many on hand.";
}
}
}
catch (Exception ex)
{
lblQuan.Text = "That's not a valid number.";
}
}