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How It Works The most important bit of code here is when you remove the object from the session state: Session.Remove("search") Toggling visibility of items depending on the session state presence makes the page shown in Figure 6-5 appear the first time now. To gain more granular control over the session state, ASP .NET provides two events that are fired at different points during the life of the user session: Start and End.

is important to remember, because often in magazines and some computer manuals, the use of the hash symbol before a command indicates that it should be run as root. In addition, if you use the rescue function of the install CD, you ll be running as root, and a hash will appear at the prompt. See 14 for more information about the root user.

Any collection, including collections of values and arrays, can be declared not to be lazy. The obvious problem with lazy collections is populating them in a multitier application, such as a web application, where keeping the Session open can be tricky. We present a few solutions to this problem in chapter 8. In addition to being lazily populated, collections can be sorted. Sorted collections are the topic of the next section.

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Figure 6-5. On the Search page, selective controls visibility depends on the session state items. You can attach event handlers for them through the special file Global.asax. This file allows you to add handlers to these kinds of events, which are global in the sense that they don t happen inside a single page or control. They belong to the web application as a whole. You ll use other global events later in this chapter. For now, you need to use only the following special syntax in the Global.asax code-behind file to handle the session Start and End events: Sub Session_Start(ByVal sender As Object, ByVal e As EventArgs) ' Fires when the session is started End Sub Sub Session_End(ByVal sender As Object, ByVal e As EventArgs) ' Fires when the session ends End Sub The empty signatures are already placed there whenever you start a new web application. A good use of such methods would be, for example, to release expensive or locked resources, such as a file or a database connection, if you keep it in the session state (a generally unadvisable practice, given the fact that ADO.NET already provides connection pooling), or to initialize some context related to the user as soon as the session starts, such as reloading a previously saved shopping cart. Note that the Session_End() event will be fired only when using InProc mode for the sessionState configuration element, as explained in the next section.

When we refer to commands at the shell, we re actually talking about small programs. When you type a command to list a directory, for example, you re actually starting a small program that will do that job. Seen in this light, the shell s main function is to simply let you run programs either those that are built into the shell, such as ones that let you manipulate files, or other, more complicated programs that you ve installed yourself. The shell is clever enough to know where your programs are likely to be stored. This information was given to it when you first installed Ubuntu and is stored in a system variable.

Note A variable is the method Linux uses to remember things like names, directory paths, or other data. There are many system variables that are vital for the running of Ubuntu. These variables can be seen by typing set at the command prompt.

A common requirement when dealing with collections is to sort them according to some criteria. The sorting criteria can be fixed or arbitrary, depending on application requirements. Hibernate supports sorting sets, maps, and bags. If you always want a collection returned in the same order, you can take advantage of the order-by attribute in

However, you should use the session state carefully, because it can severely affect scalability if it s used without care. In this example, you were careful to limit the amount of information placed there as a result of a search.

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