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The secret to getting the most out of caching is choosing the right time to use it A good caching strategy identifies the most frequently used pieces of data that are the most time-consuming to create, and stores them If you store too much information, you risk filling up the cache with relatively unimportant data, and forcing out the content you really want to keep Here are two caching guidelines to keep you on the right track: Cache data (or web pages) that are expensive: In other words, cache information that s time-consuming to create The results of a database query or contents of a file are good examples Not only does it take time to open a database connection or a file, but it can also delay or lock out other users who are trying to do the same thing at the same time.

// Code goes here. } } } In the preceding example, the Product class is in the namespace MyCompany.MyApp. Code inside this namespace can access the Product class by name. Code outside it needs to use the fully qualified name, as in MyCompany.MyApp.Product. This ensures that you can use the components from various third-party developers without worrying about a name collision. If those developers follow the recommended naming standards, their classes will always be in a namespace that uses the name of their company and software product. The fully qualified name of a class will then almost certainly be unique. Namespaces don t take an accessibility keyword and can be nested as many layers deep as you need. Nesting is purely cosmetic for example, in the previous example, no special relationship exists between the MyCompany namespace and the MyApp namespace. In fact, you could create the namespace MyCompany.MyApp without using nesting at all using this syntax: namespace MyCompany.MyApp { public class Product { // Code goes here. } } You can declare the same namespace in various code files. In fact, more than one project can even use the same namespace. Namespaces are really nothing more than a convenient, logical container that helps you organize your classes.

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Cache data (or web pages) that are used frequently: There s no point setting aside memory for information that s never going to be needed again For example, you might choose not to cache product detail pages, because there are hundreds of different products, each with its own page But it makes more sense to cache the list of product categories, because that information will be reused to serve many different requests If you keep these two rules in mind, you can get two benefits from caching at once you can improve both performance and scalability Performance is a measure of how quickly a web page works for a single user Caching improves performance, because it bypasses bottlenecks like the database As a result, web pages are processed and sent back to the client more quickly.

sb.Append("<b>"); sb.Append(customer.CompanyName); sb.Append("</b><br />"); // List this customer's orders. foreach (Order order in customer.Orders) { sb.Append(order.OrderID.ToString()); sb.Append(" - made on date: "); sb.Append(order.OrderDate.Value.ToShortDateString()); sb.Append("<br />"); } // Add a horizontal line. sb.Append("<hr /><br />"); } // Show the HTML in a Label control. lblData.Text = sb.ToString(); Figure 24-11 shows the result.

A CA is an organization that is responsible for issuing and revoking certificates for third parties. It is the responsibility of the CA to verify the identity of certificate users. Thus, it is exclusively the CA that is enabled to communicate this authority to the web servers and clients that operate with your certificates. Most modern web browsers have a list of trusted CAs that are enabled by default. These are the guys you need to pay money to when you want to set up an SSL-enabled web site for public consumption. When interacting with client-side certificates, however, you are the CA, as it would be foolish to trust a public CA to control access to your web application. This presents a few challenges: You must set up the infrastructure required to be a CA. You must configure all your software to use your CA to verify client certificates. You must handle issuing the client certificate.

Scalability measures how the performance of your web application degrades as more and more people use it at the same time Caching improves scalability, because it allows you to reuse the same information for requests that happen in quick succession With caching, more and more people can use your website, but the number of trips to the database won t change very much Therefore, the overall burden on the system will stay relatively constant, as shown in Figure 24-1 Many optimization techniques enhance scalability at the cost of performance, or vice versa Caching is remarkable because it gives you the best of both worlds..

Tip Writing exception handling logic for this sort of code can be tricky. The database operations occur

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