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Adding the Web Reference
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To consume the web service, you need to add a web reference to it first. This is done by rightclicking on the website and choosing Add Web Reference. In the dialog box that appears, you can either specify the complete URL of EcommerceService.asmx or use the Services from This Solution option. Figure B-2 shows this dialog box.
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Figure B-2. Adding a web reference to ECommerceService.asmx
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APPENDIX B C AS E STUDY: A WEB S ERVICE DRIV EN S HOPPIN G CA RT
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Keep the web reference name to the default value of localhost and click the Add Reference button. Visual Studio will add the App_WebReferences folder to your website and will store the web reference files in it.
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Displaying the Product Catalog
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Figure B-3 shows Default.aspx in design mode.
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Figure B-3. Product catalog page in design mode The page consists of a GridView that lists all the products in a template field. The Add to Cart button is used to add that product to the shopping cart. It also contains an Object Data Source control. Listing B-10 shows the complete markup of Default.aspx. Listing B-10. Markup of Default.aspx <%@ Page Language="C#" AutoEventWireup="true" Inherits="_Default" %> CodeFile="Default.aspx.cs"
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" > <head runat="server"> <title>Untitled Page</title> </head> <body> <form id="form1" runat="server"> <div>
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APPEN DI X B CAS E S TUD Y: A WEB S ERVI CE D RI VEN SH OPPI NG C ART
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<asp:Label ID="Label1" runat="server" Font-Bold="True" Font-Names="Arial" Font-Size="X-Large" Text="Product Catalog"></asp:Label><br /> <hr /> <br /> <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" CellPadding="4" DataSourceID="ObjectDataSource1" ForeColor="#333333" GridLines="None" OnSelectedIndexChanged="GridView1_SelectedIndexChanged" DataKeyNames="Id" Width="341px"> <FooterStyle BackColor="#990000" Font-Bold="True" ForeColor="White" /> <Columns> <asp:TemplateField HeaderText="Products"> <ItemTemplate> <table style="width: 100%"> <tr> <td nowrap="noWrap"> <asp:Label ID="Label2" runat="server" Font-Bold="True" Text='<%# Eval("Name") %>' Font-Size="Large"></asp:Label> </td> </tr> <tr> <td style="height: 21px" nowrap="noWrap"> <asp:Label ID="Label3" runat="server" Text='<%# Eval("Description") %>'></asp:Label> </td> </tr> <tr> <td nowrap="noWrap"> <asp:Label ID="Label5" runat="server" Font-Bold="True" Text="Price :"></asp:Label> <asp:Label ID="Label4" runat="server" Text='<%# Eval("UnitPrice","{0:C}") %>' Font-Bold="True"></asp:Label> </td> </tr> <tr> <td nowrap="nowrap"> <asp:Button ID="Button1" runat="server" CommandArgument='<%# Eval("Id") %>' CommandName="Select" Text="Add To Cart" /> </td> </tr> </table> </ItemTemplate> </asp:TemplateField> </Columns>
APPENDIX B C AS E STUDY: A WEB S ERVICE DRIV EN S HOPPIN G CA RT
<RowStyle BackColor="#FFFBD6" ForeColor="#333333" /> <SelectedRowStyle BackColor="#FFCC66" Font-Bold="True" ForeColor="Navy" /> <PagerStyle BackColor="#FFCC66" ForeColor="#333333" HorizontalAlign="Center" /> <HeaderStyle BackColor="#990000" Font-Bold="True" ForeColor="White" /> <AlternatingRowStyle BackColor="White" /> </asp:GridView> </div> <asp:ObjectDataSource ID="ObjectDataSource1" runat="server" SelectMethod="GetProducts" TypeName="localhost.ECommerceService"> </asp:ObjectDataSource> <br /> <asp:HyperLink ID="HyperLink1" runat="server" Font-Bold="True" NavigateUrl="~/ShoppingCart.aspx">Go To Shopping Cart</asp:HyperLink> </form> </body> </html> Notice the use of the Eval() data-binding expression in binding columns such as Id, Name, UnitPrice, and Description to various labels. To configure the Object Data Source control, you need to set its TypeName property to localhost.ECommerceService. Also, set its SelectMethod property to GetProducts(). At run time the Object Data Source control creates an instance of the class specified by the TypeName property and calls SelectMethod on it. The returned data is then supplied to the GridView. There is a hyperlink at the bottom of the web form that points to ShoppingCart.aspx. This way, the user can navigate to the shopping cart. Now go to the code-behind file of the web form and import the localhost namespace. Remember that localhost is the web reference name that you specified while creating the web service proxy. Each user should have a unique shopping cart ID. Though you can use any unique ID, it is best to use Globally Unique Identifiers (GUIDs) so you are sure that the cart has a unique value globally. The code that generates a GUID for a user is shown in Listing B-11. Listing B-11. Creating a Unique Shopping Cart Identifier protected void Page_Load(object sender, EventArgs e) { if (Session["cartid"] == null) { Session["cartid"]= Guid.NewGuid().ToString(); } }
APPEN DI X B CAS E S TUD Y: A WEB S ERVI CE D RI VEN SH OPPI NG C ART
In the Page_Load event, we check whether a session variable named cartid already exists. If not, we create a new GUID by using the NewGuid() method of the Guid class. The GUID is then stored in the cartid session variable. This variable is used further while calling various web methods. Whenever a user clicks the Add to Cart button, we should add that product to the user s shopping cart. This is done in the SelectedIndexChanged event handler, as shown in Listing B-12. Listing B-12. Adding a Product to the Shopping Cart protected void GridView1_SelectedIndexChanged(object sender, EventArgs e) { ECommerceService proxy = new ECommerceService(); proxy.AddItem(Session["cartid"].ToString(), Convert.ToInt32(GridView1.SelectedValue), 1); } The code creates an instance of the ECommerceService proxy class. Then the AddItem() method of the proxy class is called. The shopping cart identifier stored in the session is passed to the AddItem() method along with the product ID. Because we set the DataKeyNames property of the GridView to Id, the SelectedValue property returns the value of the Id column for the selected row. The quantity is passed as 1.
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