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Partial rendering is the programming technique centered on the UpdatePanel control. In ASP.NET, the UpdatePanel control represents the shortest path to Ajax. It allows you to add effective Ajax capabilities to sites written according to the classic programming model of ASP.NET Web Forms. As a developer, you have no new skills to learn, except the syntax and semantics of the UpdatePanel control. The impact on existing pages is very limited, and the exposure to JavaScript is very limited even null in most common situations. You might wonder how partial rendering differs from classic postbacks. The difference is in how the postback is implemented instead of letting the browser perform a full-page refresh, the UpdatePanel control intercepts any postback requests and sends an out-of-band request for fresh markup to the same page URL. Next, it updates the DOM tree when the response is ready. Let s investigate the programming interface of the control.

Figure 12-2 The Debug Location toolbar displays the thread name and other information about the running process.

The UpdatePanel control is a container control defined in the System.Web.Extensions assembly. It belongs specifically to the System.Web.UI namespace. Although it s logically similar to the classic ASP.NET Panel control, the UpdatePanel control differs from the classic panel control in a number of respects. In particular, it doesn t derive from Panel and,

Figure 12-3

subsequently, it doesn t feature the same set of capabilities as ASP.NET panels, such as scrolling, styling, wrapping, and content management. The UpdatePanel control derives directly from Control, meaning that it acts as a mere Ajax-aware container of child controls. It provides no user-interface-related facilities. Any required styling and formatting should be provided through the child controls. In contrast, the control sports a number of properties to control page updates and also exposes a client-side object model. Consider the following classic ASP.NET code:

The Performance utility offers a way to monitor threads and the performance bottlenecks they might create. (See Figure 12-4.) The .NET Framework has a performance object named .NET CLR LocksAndThreads that exposes several counters, the most important of which are

<asp:GridView ID="GridView1" runat="server" DataSourceID="ObjectDataSource1" AllowPaging="True" AutoGenerateColumns="False"> <Columns> <asp:BoundField DataField="ID" HeaderText="ID" /> <asp:BoundField DataField="CompanyName" HeaderText="Company" /> <asp:BoundField DataField="Country" HeaderText="Country" /> </Columns> </asp:GridView> <asp:ObjectDataSource ID="ObjectDataSource1" runat="server" TypeName="YourApp.DAL.Customers" SelectMethod="LoadAll" />

# of current logical threads The current number of threads in the application known to the common language runtime in a given application. # of current physical threads The number of native Windows threads created and owned by the common language runtime.

This code causes a postback each time you click to view a new page, edit a record, or sort by a column. As a result, the entire page is redrawn even though the grid is only a small fragment of it. With partial rendering, you take the preceding markup and just wrap it with an UpdatePanel control, as shown here:

Notice that the field name is automatically placed in the table header of the first column as static text. An expression is added to the first column s detail row:

<asp:UpdatePanel ID="UpdatePanel1" runat="server"> <ContentTemplate> ... </ContentTemplate> </asp:UpdatePanel>

Part III:

In addition, you need to add a ScriptManager control to the page. That s the essence of partial rendering. And it magically just works. Well, not just magically, but it works. Note From this simple but effective example, you might be led to think that you surround the whole body of the page with an UpdatePanel control and you re done. If you do it this way, it certainly works. It might not be particularly efficient though. In the worst case, you need the same bandwidth as you do with classic ASP.NET; however, you still give your users an infinitely better experience because only a portion of the page actually refreshes. As we ll learn in the rest of the chapter, partial rendering offers a number of attributes to optimize the overall behavior and performance. However, the majority of users are more than happy with the sole effect of a partial page rendering.

# of current recognized threads The number of threads that were created outside the common language runtime (for example, in a COM component) that the runtime has recognized. contention rate/sec Rate at which threads in the runtime fail to acquire a managed lock for example, when reaching a SyncLock block. A high number for this counter is a symptom that the application isn t well designed for multithread operations. total # of contentions The total number of times threads in the common lan guage runtime have failed to acquire a managed lock. current queue/sec The average number of threads waiting to acquire a lock; a high value means that most threads spend most of their time waiting for a lock to become available.