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cart is empty). You must do this because the business tier expects to receive a numerical value as the amount.

\S{4,10}

\d{3}-\d{2}-\d{4}

In this example, you ll see how you need to write code when you want to control how the SqlDataSource behaves. 1. In Visual Web Developer, create a new Web Form called List_DataSource_Multiple.aspx. 2. Change the <title> of the page to Multiple Selection Using a SqlDataSource. 3. Make sure you ve included the correct Import statement at the top of the page. <%@ Page Language="C#" %> <%@ Import Namespace="System.Text" %> 4. In the Design view, add a ListBox, a Button, and a GridView to the page. Change the Text for the Button to Select. You can use a table to lay out the Web controls in a more userfriendly manner, as shown earlier in Figure 6-17. 5. For the ListBox, set DataTextField to ManufacturerName, DataValueField to ManufacturerID, and SelectionMode to Multiple. 6. You need two SqlDataSource controls for this example, but rather than using the graphical tools to create them, you can add them directly to the HTML markup. Switch to the Source view and add the definitions for the two SqlDataSource controls at the top of the page: <asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:SqlConnectionString %>" SelectCommand="SELECT ManufacturerID, ManufacturerName FROM Manufacturer"> </asp:SqlDataSource> <asp:SqlDataSource ID="SqlDataSource2" runat="server" ConnectionString="<%$ ConnectionStrings:SqlConnectionString %>"> </asp:SqlDataSource> 7. Switch to the Design view and set the DataSourceID for the ListBox to SqlDataSource1 and for the GridView to SqlDataSource2.

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This stored procedure is different from the others in that it returns a single value instead of a result set. In the business tier, you ll retrieve this value using the ExecuteScalar method of the DbCommand object.

* You have many different ways to validate e-mail addresses with regular expressions of varying complexity. See http://www.4guysfromrolla.com/webtech/validateemail.shtml for a discussion of the subject and numerous examples.

Some logic is much more difficult to model in a regular expression. An example is the Luhn algorithm, which verifies credit card numbers by first doubling every second digit, then adding these doubled digits together, and finally dividing the sum by ten. The number is valid (although not necessarily connected to a real account) if there is no remainder after dividing the sum. To use the Luhn algorithm, you need a CustomValidator control that runs this logic on the supplied value. (You can find a detailed description of the Luhn algorithm at http://en.wikipedia.org/wiki/Luhn_formula.)

8. Add a Click event handler for the Button. Then add the following code: protected void Button1_Click(object sender, EventArgs e) { // set up SQL query for Player table StringBuilder Query = new StringBuilder("SELECT PlayerID, PlayerName, PlayerManufacturerID, PlayerCost, PlayerStorage FROM Player WHERE PlayerManufacturerID IN ("); bool gotResult = false; for (int i = 0; i < ListBox1.Items.Count; i++) { if (ListBox1.Items[i].Selected) { if (gotResult == true) Query.Append(","); Query.Append(ListBox1.Items[i].Value); gotResult = true; } } Query.Append(")"); if (gotResult) { // set the correct SelectCommand SqlDataSource2.SelectCommand = Query.ToString(); } else { // clear the GridView SqlDataSource2.SelectCommand = null; } } 9. Save the page, and then run it in your browser. You ll see the ListBox containing the list of Manufacturers. To select more than one item, hold down the Ctrl key. Clicking the Select button will cause the GridView to be populated with the Manufacturers you ve selected, as shown earlier in Figure 6-18.

To bring together these various topics, you ll now see a full-fledged web form that combines a variety of pieces of information that might be needed to add a user record (for example, an e-commerce site shopper or a content site subscriber). Figure 8-6 shows this form.

You ll write the business layer methods for the shopping cart in a separate class named ShoppingCartAccess. The ShoppingCartAccess class supports the functionality required for the presentation layer of the shopping cart and calls the stored procedures you wrote earlier. For example, when the visitor clicks the Add to Cart button, a method of the ShoppingCartAccess class named AddProduct is called. None of the methods receives a CartID parameter, which might appear strange because all the stored procedures you ve written so far require a CartID parameter. So, how does the AddItem method know which CartID to send to the ShoppingCartAddItem stored procedure

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