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Next, the code searches to see if this product is already in the cart. If it is, the Units property of the corresponding ShoppingCartItem is incremented by 1, as shown here: ... // Search to see if an item of this type is already in the cart. Boolean inCart = false; foreach (ShoppingCartItem item in Profile.Cart) { // Increment the number count. if (item.ProductID == (int)row["ProductID"]) { item.Units += 1; inCart = true; break; } } ... If the item isn t in the cart, a new ShoppingCartItem object is created and added to the collection, as follows: ... // If the item isn t in the cart, add it. if (!inCart) { ShoppingCartItem item = new ShoppingCartItem( (int)row["ProductID"], (string)row["ProductName"], (decimal)row["UnitPrice"], 1); Profile.Cart.Add(item); } ... Finally, the selected index is cleared so that the product row doesn t become highlighted. (You could also set the selection style so that the selected row doesn t appear to the user.) The act of selection is now complete. ... // Don't keep the item selected in the product list. gridProducts.SelectedIndex = -1; } Notice that the GridView that displays the shopping cart information binds directly to the ShoppingCart collection. Creating this GridView is fairly straightforward. You can use BoundField tags in the same way that you would with a table, except now the DataField identifies the name of one of the properties in the ShoppingCartItem class. Here are the bound columns used in the GridView for the shopping cart details: <asp:BoundField DataField="ProductID" HeaderText="ID"></asp:BoundField> <asp:BoundField DataField="ProductName" HeaderText="Product Name"> </asp:BoundField> <asp:BoundField DataField="UnitPrice" HeaderText="Unit Price" DataFormatString="{0:C}"></asp:BoundField> <asp:BoundField DataField="Total" HeaderText="Total" DataFormatString="{0:C}"></asp:BoundField> The column for displaying the Units property is slightly different. It uses a TemplateField. The template uses a text box, which displays the number of desired units, and allows the user to edit this number.

<asp:TemplateField HeaderText="Units"> <HeaderStyle Width="5px"></HeaderStyle> <ItemTemplate> <asp:TextBox runat="server" Font-Size="XX-Small" Width="31px" Text='<%# DataBinder.Eval(Container, "DataItem.Units") %>'> </asp:TextBox> </ItemTemplate> </asp:TemplateField> If a user does decide to change the number of units for an item, the change must be committed by clicking an Update link in another column: <asp:CommandField ShowSelectButton="True" SelectText="Update" /> For simplicity, this link is also treated as a select command. However, with slightly more code you could use the RowCommand event instead (as discussed in 10). When the user clicks the Update link, the GridView.RowCommand event fires. At this point, the code finds the corresponding ShoppingCartItem instance and updates the Units property (or removes the item entirely if the count has reached 0). Here s the code that performs this task: protected void gridCart_SelectedIndexChanged(object sender, EventArgs e) { // The first control in a template column is always a blank LiteralControl. // The text box is the second control. TextBox txt = (TextBox)gridCart.Rows[gridCart.SelectedIndex].Cells[3].Controls[1]; try { // Update the appropriate cart item. int newCount = int.Parse(txt.Text); if (newCount > 0) { Profile.Cart[gridCart.SelectedIndex].Units = newCount; } else if (newCount == 0) { cart.RemoveAt(gridCart.SelectedIndex); } } catch { // Ignore invalid (nonnumeric) entries. } gridCart.SelectedIndex = -1; } Invalid entries are simply ignored using an exception handler. Another option is to use a CompareValidator validation control to prevent the user from entering negative numbers or text. As written, this example is fairly powerful, and it s a reasonable starting point for creating a shopping cart for a highly professional application. All you need to do is implement the checkout logic, which would commit the order to the database and clear the Profile.Cart by replacing it with a new, empty shopping cart.

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Another refinement you might want to add to this example is to allow the product list to support multiple selection (similar to the way files are selected in a Hotmail inbox). The basic approach is to

create a template column that includes a CheckBox control. When the user clicks another button (such as submit), you can loop over all the items in the GridView and check the state of the check box in each item. If the state is checked, you would then add that item to the shopping cart.

Indicates whether the database supports savepoints in addition to full transactions. Savepoints allow database queries to be rolled back on a more granular basis, without requiring the entire transaction to be undone if something goes wrong. This attribute defaults to ; setting it to will also require implementations for the , and methods described in the next section.

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