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You might want to experiment with what other types of collections you can bind to a list control. One interesting option is to use a built-in ASP.NET control such as the Session object. An item in the list will be created for every currently defined Session variable, making this trick a nice little debugging tool to quickly check current session information.

accessibility keywords, because they improve clarity. Most programmers agree that it s a good approach to explicitly spell out the accessibility of your code.

Along with the DataTextField property, all list controls that support data binding also provide a DataValueField property, which adds the corresponding information to the value attribute in the control element. This allows you to store extra (undisplayed) information that you can access later. For example, you could use these two lines to define your data binding with the previous example: MyListBox.DataTextField = "Value" MyListBox.DataValueField = "Key" The control will appear the same, with a list of all the fruit names in the collection. However, if you look at the rendered HTML that s sent to the client browser, you ll see that value attributes have been set with the corresponding numeric key for each item: <select name="MyListBox" id="MyListBox" > <option value="1">Kiwi</option> <option value="2">Pear</option> <option value="3">Mango</option> <option value="4">Blueberry</option> <option value="5">Apricot</option> <option value="6">Banana</option> <option value="7">Peach</option> <option value="8">Plum</option> </select> You can retrieve this value later using the SelectedItem property to get additional information. For example, you could set the AutoPostBack property of the list control to True, and add the following code: Protected Sub MyListBox_SelectedIndexChanged(ByVal sender As Object, _ ByVal e As EventArgs) Handles MyListBox.SelectedIndexChanged lblMessage.Text = "You picked: " & MyListBox.SelectedItem.Text lblMessage.Text &= " which has the key: " & MyListBox.SelectedItem.Value End Sub

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Invoking your methods is straightforward you simply type the name of the method, followed by parentheses. If your method returns data, you have the option of using the data it returns or just ignoring it: // This call is allowed. MyMethodNoReturnedData(); // This call is allowed. MyMethodReturnsData(); // This call is allowed. int myNumber; myNumber = MyMethodReturnsData(); // This call isn't allowed. // MyMethodNoReturnedData() does not return any information. myNumber = MyMethodNoReturnedData();

Figure 16-7 demonstrates the result. This technique is particularly useful with a database. You could embed a unique ID into the value property and be able to quickly look up a corresponding record depending on the user s selection by examining the value of the SelectedItem object.

SoapServer::addFunction(mixed $functions)

Methods can also accept information through parameters. Parameters are declared in a similar way to variables. By convention, parameter names always begin with a lowercase letter in any language. Here s how you might create a function that accepts two parameters and returns their sum: private int AddNumbers(int number1, int number2) { return number1 + number2; } When calling a method, you specify any required parameters in parentheses or use an empty set of parentheses if no parameters are required: // Call a method with no parameters. MyMethodNoReturnedData(); // Call a method that requires two integer parameters. MyMethodNoReturnedData2(10, 20); // Call a method with two integer parameters and an integer return value. int returnValue = AddNumbers(10, 10);

Figure 16-7. Binding to the key and value properties Note that for this to work, you can t regenerate the list after every postback. If you do, the selected item information will be lost and an error will occur. The preceding example handles this by checking the Page.IsPostBack property. If it s False (which indicates that the page is being requested for the first time), the page builds the list. When the page is rendered, the current list of items is stored in view state. When the page is posted back, the list of items already exists and doesn t need to be re-created.

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