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Drawer Code 3/9 in Font CACHING AND PERFORMANCE TUNING

CHAPTER 12 CACHING AND PERFORMANCE TUNING
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Figure 12-15. Managing redirection on the server When you run the code to test this, you may also notice that the URL shown in the Address box of the browser is the address of the original request (NewUser.aspx), even though the page returned to the browser is clearly Login.aspx. That s because the server transferred execution to Default.aspx without telling the browser about the transfer. This may make things difficult for users if they want to bookmark pages, for example. You ll need to evaluate whether this drawback is an acceptable trade-off for the reduced network traffic.
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Using Web Controls Conservatively
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You learned about the power of web controls back in 3. When you re using web controls, you need to be aware that they can involve a lot of processing work for the server, because these controls must be initialized, their properties set, their events handled, and so on. So, you should take a look at each web control in your application and consider whether you really need to use a web control for that function. For example, take a look at the code in the ViewPlace.aspx file. In particular, note the following <asp:panel> control there: <headertemplate> <asp:panel id="Panel1" runat="server" cssclass="PlaceTitle"> List of Places </asp:panel> </headertemplate> The <asp:panel> control here is not manipulated anywhere in ViewPlace.aspx.vb or in any other code. It s just used to hold three words of text, styled using the PlaceTitle CSS class. However, it s still a web control and consequently demands server processing time. Since this control isn t manipulated at all, this just wastes processing time. Try It Out: Avoid Unnecessary Web Controls Now you ll rewrite ViewPlace.aspx to demonstrate how to use web controls conservatively, and get a slight performance gain in this case. Simply open ViewPlace.aspx and replace the <asp:panel> control with an HTML <div> tag, as follows: <headertemplate> <div class="PlaceTitle"> List of Places </div> </headertemplate>
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CHAPTER 12 CACHING AND PERFORMANCE TUNING
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How It Works The <div> element provides the same rendering effect as the <asp:panel> control, but doesn t require server-side processing. Note that you use the <div> element s class attribute to attach the same CSS class as you used before. As an exercise, you may want to go hunting for other controls in Friends Reunion that may be converted to plain HTML. Label and Panel controls are great candidates for this!
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Disabling Session State
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It s very convenient that you can just throw objects into session state and use them later, but this convenience comes at a cost. By default, session state is enabled, which means that ASP .NET does all the work involved in making the session state feature available, even if you don t use it. Therefore, it s worth overriding the default value for those pages that do not perform any session handling. You disable session state by setting the EnableSessionState attribute to false in the Page directive: <%@ Page Language="vb" ... EnableSessionState="false" %> If you have a page that reads values from session state (but does not write new values or modify existing ones), then it uses session state in a sort of read-only mode. In these cases, you can set the EnableSessionState attribute to ReadOnly, which will provide the page with access to session state but with less overhead (because it omits the writing capabilities). If you don t use session state anywhere in your application, you can simply turn it off at the application level by setting the <sessionState> element s mode attribute to Off in Web.config: <sessionState mode="Off" stateConnectionString="tcpip=127.0.0.1:42424" sqlConnectionString="data source=127.0.0.1;user id=sa;password=" cookieless="false" timeout="20" />
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Caution Be careful to use an uppercase letter O when setting the value, because it is case-sensitive!
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Finally, be aware that in State Service and SQL State session modes, session data must be serialized and deserialized to get it in and out of storage, and the cost of this processing will directly depend on the complexity of your objects.
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