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The Duration attribute instructs ASP.NET to cache the page for 20 seconds. The VaryByParam attribute is also required but you ll learn about its effect later on in the Caching and the Query String section. When you run the test page, you ll discover some interesting behavior. The first time you access the page, you will see the current time displayed. If you refresh the page a short time later, however, the page will not be updated. Instead, ASP.NET will automatically send the cached HTML output to you, until it expires in 20 seconds. When the cached page expires, ASP.NET will run the page code again, generate a new cached copy, and use that for the next 20 seconds. Twenty seconds may seem like a trivial amount of time, but in a high-volume site, it can make a dramatic difference. For example, you might cache a page that provides a list of products from a catalog. By caching the page for 20 seconds, you limit database access for this page to three operations per minute. Without caching, the page will try to connect to the database once for each client and could easily make dozens of requests in the course of 20 seconds. Of course, just because you request that a page should be stored for 20 seconds doesn t mean that it actually will be. The page could be evicted from the cache early if the system finds that memory is becoming scarce. This allows you to use caching freely, without worrying too much about hampering your application by using up vital memory.

<body> <form id="form1" runat="server"> <div> Name: <asp:Label ID="lblName" runat="server"></asp:Label> <br /> Country: <asp:Label ID="lblCountry" runat="server"></asp:Label> <br /> Contact: <asp:HyperLink ID="lnkEmail" runat="server"></asp:HyperLink> <br /> Homesite: <asp:HyperLink ID="lnkWebsite" runat="server"></asp:HyperLink> <br /><br /> Name: <asp:Label ID="lblName2" runat="server"></asp:Label> <br /> Country: <asp:Label ID="lblCountry2" runat="server"></asp:Label> <br /> Contact: <asp:HyperLink ID="lnkEmail2" runat="server"></asp:HyperLink> <br /> Homesite: <asp:HyperLink ID="lnkWebsite2" runat="server"></asp:HyperLink> <br /><br /> <asp:Label ID="lblError" runat="server"></asp:Label><br /> </div> </form> </body> 4. Within the code for the page, remove the global DataSet definition and move it to the Page_Load event, as follows: // create a new DataAdapter SqlDataAdapter myAdapter = new SqlDataAdapter(); myAdapter.SelectCommand = myCommand; // create the DataSet DataSet myDataSet = new DataSet(); // use try finally clauses when the connection is open. try

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When you recompile a cached page, ASP.NET will automatically remove the page from the cache. This Tip prevents problems where a page isn t properly updated, because the older, cached version is being used. However, you might still want to disable caching while testing your application. Otherwise, you may have trouble using variable watches, breakpoints, and other debugging techniques, because your code will not be executed if a cached copy of the page is available.

Single Item Purchases is a PayPal feature that allows you to send the visitor directly to a payment page instead of the PayPal shopping cart. The PayPal shopping cart will become useless in 9, where you ll create your own shopping cart. In 10, you ll implement the Place Order button in the shopping cart, which saves the order into the database and forwards the visitor to a PayPal payment page. To call the PayPal payment page (bypassing the PayPal shopping cart), redirect to a link like the following: https://www.paypal.com/xclick/business=youremail@yourserver.com&item_name=Order#1 23&item_number=123&amount=123.00¤cy=USD The Website Payments Standard Integration Guide includes all the options available for this feature.

Another option is to cache the page exclusively on the client side. In this case, the browser stores a copy and will automatically use this page if the client browses back to the page or retypes the page s URL. However, if the user clicks the Refresh button, the cached copy will be abandoned, and the page will be rerequested from the server, which will run the appropriate page code once again. You can cache a page on the client side using the Location attribute in the OutputCache directive, which specifies a value from the System.Web.UI.OutputCacheLocation enumeration. Possible values include Server (the default), Client, None, and Any.

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