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Finally, sessions are implemented by means of cookies, so they aren t available when cookZ ies are disabled (even though the IIS SDK contains a utility that helps you work around this problem by storing the user ID in the URL instead of a client-side cookie) Application variables You can use this technique only for data shared by all the clients that are connected to the application, so its usefulness is limited, in practice, to caching read-only data such as a database connection string or the table of product codes and prices Finally, Application values aren t shared among Web gardens and farms Hidden fields or the query string This approach doesn t require cookie support but can t be implemented easily and usually requires rather contorted coding techniques.

public class RegularDoor : IDoor { ... } public class TimedDoor : IDoor, ITimedDoor { ... }

Moreover, unlike cookies and session variables, values stored in hidden fields or the query string are lost when the user hits the Back button to return to a page visited previously Database records plus a cookie or a session variable that holds the key associated with each user This technique is the only one that scales well even with large amounts of data and that (if you use a cookie) can scale out to Web farms It has some drawbacks, however: it requires extra coding, is slower than all other techniques, and still requires client-side cookie support..

Unlike classes, interfaces can be easily summed up; so there s really no reason to have fat interfaces any more.

Although all these ASP techniques are still available under ASP.NET, you ll rarely use some of them directly because ASP.NET offers some great alternatives. For example, the Page s ViewState property works exactly like hidden fields, but it s remarkably

I consider Dependency Inversion to be the most important of the five SOLID principles. You don t need it in every class and method that you write, but if you miss it where you need it, well, you re in serious trouble. Take a look at Figure 13-1.

Report Authoring with Custom Development CD-437

I m not sure the idea behind this figure is completely original, and I don t even know if there s anybody I should thank for that. For sure, I remember having seen it somewhere, likely at some software conference somewhere in the world. Then I simply revised the idea and made it mine. So you have built the architecture of your system by simply composing parts. What if, at some point during development, you need to replace or significantly modify one of the building blocks As the graphics attempts to show, it might be hard to change some of the building blocks that form the skeleton of the system. Dependency inversion is simply aimed at making this difficult task simpler and less expensive. The principle says that every high-level module should always depend on abstractions of lower level modules. This is just a reformulation of the concept of interface-based programming.

Part VI:

The idea behind Dependency Inversion doesn t need a complex scenario to be effectively illustrated. Just imagine a method that reads bytes from a stream and writes them out to some buffer:

simpler to use. As you ll see shortly, ASP.NET supports additional session modes that work across Web farms, can use a database to store user data, and can even function without cookie support. Almost unbelievably, you can switch from regular sessions to these enhanced session modes by simply changing a configuration setting without editZ ing a single line in code. Another important facet of ASP.NET programming is using its caching features corZ rectly. As you ll learn later in this chapter, ASP.NET supports different types of cache techniques. You can cache the output generated by a page and you can cache large data structures in the Cache object. In both cases, you can enforce sophisticated expiZ ration policies. And you can still use other forms of caching as well for example, application and session variables.

void Copy() { Byte byte; while(byte = ReadFromStream()) WriteToBuffer(byte); }