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For your second set of math problems, look at the Math Problem 2 section midway down the worksheet, as shown in Figure 1-7.

As you can see in the default routes.php configuration file, the basic route is called as the Router::connect() function with a path as well as an array storing route parameters: Router::connect('/', array('controller' => 'pages', 'action' => 'display', 'home')); The previous line is the base route for the application. It connects URL elements to the Pages controller s Display action and sends the value home as a parameter to be used in the action. By specifying another controller and action, you can change the base route so that, by default, the home page is other than the Pages controller s Display action.

To start, the connection string is defined as a private variable for the page class and retrieved from the connection string: Private connectionString As String = _ WebConfigurationManager.ConnectionStrings("Pubs").ConnectionString

The list box is filled when the Page.Load event occurs. Because the list box is set to persist its view state information, this information needs to be retrieved only once the first time the page is displayed. It will be ignored on all postbacks. Here s the code that fills the list from the database: Protected Sub Page_Load(ByVal sender As Object, _ ByVal e As EventArgs) Handles Me.Load If Not Page.IsPostBack Then FillAuthorList() End If End Sub Private Sub FillAuthorList() lstAuthor.Items.Clear() ' Define the Select statement. ' Three pieces of information are needed: the unique id ' and the first and last name. Dim selectSQL As String = "SELECT au_lname, au_fname, au_id FROM Authors" ' Define the ADO.NET objects. Dim con As New SqlConnection(connectionString) Dim cmd As New SqlCommand(selectSQL, con) Dim reader As SqlDataReader ' Try to open database and read information. Try con.Open() reader = cmd.ExecuteReader() ' For each item, add the author name to the displayed ' list box text, and store the unique ID in the Value property. Do While reader.Read() Dim newItem As New ListItem() newItem.Text = reader("au_lname") & ", " & reader("au_fname") newItem.Value = reader("au_id").ToString() lstAuthor.Items.Add(newItem) Loop reader.Close() Catch err As Exception lblResults.Text = "Error reading list of names." lblResults.Text &= err.Message Finally con.Close() End Try End Sub

This example looks more sophisticated than the previous bite-sized snippets in this chapter, but it really doesn t introduce anything new. It uses the standard Connection, Command, and DataReader objects. The Connection is opened inside an error-handling block so your page can handle any unexpected errors and provide information. A Finally block makes sure the connection is properly closed, even if an error occurs. The actual code for reading the data uses a loop. With each pass, the Read() method is called to get another row of information. When the reader has read all the available information, this method will return False, the loop condition will evaluate to False, and the loop will end gracefully. The unique ID (the value in the au_id field) is stored in the Value property of the list box for reference later. This is a crucial ingredient that is needed to allow the corresponding record to be queried again. If you tried to build a query using the author s name, you would need to worry about authors with the same name. You would also have the additional headache of invalid characters (such as the apostrophe in O Leary) that would invalidate your SQL statement.