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You can walk over the structure of a Menu control in much the same way as the structure of a TreeView. The Menu contains a collection of MenuItem objects in the Items property, and each MenuItem has a ChildItems collection that contains nested items. For example, you could adapt the previous example that used the TreeView to display a list of categories and products by simply changing a few class names. Here s the code you need, with the surprisingly few changes highlighted: Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) If (Not Page.IsPostBack) Then Dim ds As DataSet = GetProductsAndCategories() ' Loop through the category records. For Each row As DataRow In ds.Tables("Categories").Rows ' Use the constructor that requires just text ' and a nondisplayed value. Dim itemCategory As MenuItem = New MenuItem(row("CategoryName").ToString(), _ row("CategoryID").ToString()) Menu1.Items.Add(itemCategory) ' Get the children (products) for this parent (category). Dim childRows As DataRow() = row.GetChildRows(ds.Relations(0)) ' Loop through all the products in this category. For Each childRow As DataRow In childRows Dim itemProduct As MenuItem = New MenuItem(childRow("ProductName").ToString(), _ childRow("ProductID").ToString()) itemCategory.ChildItems.Add(itemProduct) Next Next End If End Sub

State management is the art of retaining information between requests. Usually, this information is user-specific (such as a list of items in a shopping cart, a user name, or an access level), but sometimes it s global to the whole application (such as usage statistics that track site activity). Because ASP .NET uses a disconnected architecture, you need to explicitly store and retrieve state information with each individual request. The approach you choose for storing this data can have a dramatic effect on the performance, scalability, and security of your application. To perfect your state management solution, you ll almost certainly want to consider adding caching into the mix, as described in 11.

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Protected Sub Menu1_MenuItemClick(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.MenuEventArgs) If Menu1.SelectedItem.Depth = 0 Then lblInfo.Text = "You selected Category ID: " ElseIf Menu1.SelectedItem.Depth = 1 Then lblInfo.Text = "You selected Product ID: " End If lblInfo.Text &= Menu1.SelectedItem.Value End Sub Figure 16-19 shows the result.

Information is clearly visible to the user and to anyone else who cares to eavesdrop on the Internet The enterprising user might decide to modify the query string and supply new values, which your program won t expect and can t protect against Many browsers impose a limit on the length of a URL (usually from 1 to 2 KB) For that reason, you can t place a large amount of information in the query string and still be assured of compatibility with most browsers Adding information to the query string is still a useful technique It s particularly well suited in database applications where you present the user with a list of items corresponding to records in a database, like products The user can then select an item and be forwarded to another page with detailed information about the selected item.

large number of computer applications both desktop and web applications are data-driven. These applications are largely concerned with retrieving, displaying, and modifying data. Retrieving and processing data seems like a fairly straightforward task, but over the past decade the way applications use data has changed repeatedly. Developers have moved from simple client applications that use local databases to distributed systems that rely on centralized databases on dedicated servers. At the same time, data access technologies have evolved. If you ve worked with Microsoft languages for some time, you ve most likely heard of (and possibly used) an alphabet soup of data access technologies that includes ODBC, DAO, RDO, RDS, and ADO. The .NET Framework includes its own data access technology, ADO.NET. ADO. NET consists of managed classes that allow .NET applications to connect to data sources (usually relational databases), execute commands, and manage disconnected data. The small miracle of ADO.NET is that it allows you to write more or less the same data access code in web applications that you write for client-server desktop applications, or even single-user applications that connect to a local database. This chapter describes the architecture of ADO.NET and the ADO.NET data providers. You ll learn about ADO.NET basics such as opening a connection, executing a SQL statement or stored procedure, and retrieving the results of a query. You ll also learn how to prevent SQL injection attacks and use transactions.

Overall, the Menu and TreeView controls expose strikingly similar programming models, even though they render themselves quite differently. They also have a similar style-based formatting model. But a few noteworthy differences exist: The Menu displays a single submenu. The TreeView can expand an arbitrary number of node branches at a time. The Menu displays a root level of links in the page. All other items are displayed using fly-out menus that appear over any other content on the page. The TreeView shows all its items inline in the page. TreeView supports on-demand filling and client callbacks. The Menu does not. The Menu supports templates. The TreeView does not. The TreeView supports check boxes for any node. The Menu does not. The Menu supports horizontal and vertical layouts, depending on the Orientation property. The TreeView supports only vertical layout.

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