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One easy way to implement this design is to have the first page send the item ID to the second page The second page then looks that item up in the database and displays the detailed information You ll notice this technique in e-commerce sites such as Amazoncom..

ASP.NET includes a new data binding framework that can hide the underlying ADO.NET plumbing in your web pages. You can skip to 9 to start learning about these features right away. However, to build truly scalable high-performance web applications, you ll need to write custom database code (and your own database components). That means you ll need a thorough understanding of the concepts presented in this chapter.

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The Menu control provides an overwhelming number of styles. Like the TreeView, the Menu derives a custom class from the Style base class in fact, it derives two (MenuStyle and MenuItemStyle). These styles add spacing properties (ItemSpacing, HorizontalPadding, and VerticalPadding). However, you can t set menu item images through the style, because there is no ImageUrl property. Much like the TreeView, the Menu supports defining different menu styles for different menu levels. However, the key distinction that the Menu control encourages you to adopt is between static items (the root level items that are displayed in the page when it s first generated) and dynamic items (the items in fly-out menus that are added when the user moves the mouse over a portion of the menu). In most websites, there is a definite difference in the styling of these two elements. To support this, the Menu class defines two parallel sets of styles, one that applies to static items and one that applies to dynamic items, as shown in Table 16-13. Table 16-13. Menu Styles

ADO.NET does not include a connection pooling mechanism. However, most ADO.NET providers implement some form of connection pooling. The SQL Server and Oracle data providers implement their own efficient connection pooling algorithms. These algorithms are implemented entirely in managed code and in contrast to some popular misconceptions do not use COM+ enterprises services. For a connection to be reused with SQL Server or Oracle, the connection string matches exactly. If it differs even slightly, a new connection will be created in a new pool.

If you re a seasoned .NET 1.x programmer, you re probably wondering what s new in the latest iteration of ADO.NET. Without a doubt, the greatest change for ASP.NET applications is the new data binding model (described in s 9 and 10). The data binding model allows you to reduce the amount of code you write for data display, and it can even allow you avoid writing any data access code at all (if you re willing to pay the price with pages that are less flexible and more difficult to optimize).

Sets the appearance of the overall box in which all the menu items appear. In the case of StaticMenuStyle, this box is shown on the page, whereas with DynamicMenuStyle it s shown as a pop-up. Sets the appearance of individual menu items. Sets the appearance of the selected item. Note that the selected item isn t the item that s currently being hovered over. It s the item that was previously clicked (and triggered the last postback). Sets the appearance of the item that the user is hovering over with the mouse.

SQL Server and Oracle connection pooling use a full-text match algorithm. That means any minor change in the connection string will thwart connection pooling, even if the change is simply to reverse the order of parameters or add an extra blank space at the end. For this reason, it s imperative that you don t hard-code the connection string in different web pages. Instead, you should store the connection string in one place preferably the <connectionStrings> section of the web.config file.

You can also search for nodes using the methods of the current SiteMapProvider object, which is available through the SiteMap.Provider static property. For example, the SiteMap.Provider.FindSiteMapNode() method allows you to search for a node by its URL.

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