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// set up the GridView GridView1.DataSource = myReader; GridView1.DataBind(); // close the reader myReader.Close(); } An alternate way to go here would be to use the Web list control s SelectedValue and SelectedText properties instead of SelectedItem.Value and SelectedItem.Text. That approach produces the same results in this scenario, where you can select only one item from the list. However, this doesn t work with multiple-selection lists, as you ll see in the Multiple-Selection Lists section later in this chapter. Nor can you use the SelectedItem property to find all the list items selected in a group. You must choose another tack. The last two steps in the example changed the Web list control from a DropDownList to a RadioButtonList and then to a ListBox. You simply changed the HTML tags from <asp:DropDownList> to <asp:RadioButtonList> or <asp:ListBox>. Nothing else on the page changes all Web list controls have exactly the same interface, and the same methods and properties are available.

A web service can use data caching just as easily as a web page. In fact, you can store data in a web method and retrieve it in a web page, or vice versa. The only difference is that to access the Cache object in a web service, you need to use the HttpContext.Current.Cache property. It isn t provided as a property of the web service class. The following web service presents a simple example of caching at work. It provides two web methods: GetAuthorData() and GetAuthorNames(). Both of these web methods call the same private GetAuthorDataSet() method, which returns a DataSet with the full Authors table. GetAuthorData() returns this DataSet directly, while the GetAuthorNames() retrieves this DataSet, extracts just the author names, and returns it as an array of strings.

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<WebService()> _ Public Class DataCachingTest Inherits WebService Dim connectionString As String = _ WebConfigurationManager.ConnectionStrings("Pubs").ConnectionString <WebMethod()> _ Public Function GetAuthorData() As DataSet ' Return the full author DataSet (from the cache if possible). Return GetAuthorDataSet() End Function <WebMethod()> _ Public Function GetAuthorNames() As String() ' Get the customer DataSet (from the cache if possible). Dim dt As DataTable = GetAuthorDataSet().Tables(0)

8. Switch back to Visual Studio. You ll probably be asked to reload web.config, which was modified by an external program. Select Yes. 9. Next you ll create the UserInfo Web User Control, the Login Web Form, and the skeleton of the CatalogAdmin Web Form. First add the following styles to BalloonShop.css, which will be used in these pages: .UserInfoHead { border-right: #cc6666 1px solid; border-top: #cc6666 1px solid; border-left: #cc6666 1px solid; border-bottom: #cc6666 1px solid; background-color: #dc143c; font-family: Verdana, Arial; font-weight: bold; font-size: 10pt; color: #f5f5dc; padding-left: 3px; text-align: center; } .UserInfoContent { border-right: #cc6666 1px solid; border-top: #cc6666 1px solid; border-left: #cc6666 1px solid; border-bottom: #cc6666 1px solid; background-color: #ffcccc; text-align: center; } .UserInfoText { font-family: Verdana, Arial; font-size: 9pt; padding-left: 5px; text-decoration: none; } a.UserInfoLink { font-family: Verdana, Arial; font-weight: bold; font-size: 9pt; color: #ed486d; line-height: 15px; padding-left: 5px; text-decoration: none; }

In the previous example, you saw how easy it is to build a list from a DataReader. Before you can see how to do the same thing using the DataSet and SqlDataSource, you need to be aware of the events that are exposed by the Web list controls. The main problem with the previous example is that there is no way to know which Web list control the user used to cause the postback to the page. As you have only one visible Web list control, this isn t a problem. You can assume that if there has been a postback, the visible Web control caused the postback, and so populate the GridView accordingly. This is exactly what you ve done: if (Page.IsPostBack == false) { // populate the list control } else { // populate the GridView } However, when you start adding more Web controls to the page, such as a button or indeed another Web list control that has its AutoPostBack property set to true, you have a problem. How do you know which Web control has caused the postback A button has a Click event, but what about a Web list control Thankfully, a Web list control has its own event that is raised whenever the page is posted back because of a user selection within the list: SelectedIndexChanged. As you ll soon see, you can use this event to modify other Web controls.

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