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The HttpSessionState class defines a number of other members of interest beyond the type indexer. First, the SessionID property will return the current user s unique ID. If you wish to view the automatically assigned session ID for this example, handle the Load event of your page as follows: protected void Page_Load(object sender, EventArgs e) { lblUserID.Text = string.Format("Here is your ID: {0}", Session.SessionID); } The Remove() and RemoveAll() methods may be used to clear items out of the user s instance of HttpSessionState: Session.Remove("SomeItemWeDontNeedAnymore"); The HttpSessionState type also defines a set of members that control the expiration policy of the current session. Again, by default each user has 20 minutes of inactivity before the HttpSessionState object is destroyed. Thus, if a user enters your web application (and therefore obtains a unique session ID), but then does not return to the site within 20 minutes, the runtime assumes the user is no longer interested and destroys all session data for that user. You are free to change this default 20-minute expiration value on a user-by-user basis using the Timeout property. The most common place to do so is within the scope of your Session_Start() method: void Session_Start(Object sender, EventArgs e) { // Each user has 5 minutes of inactivity.

Session.Timeout = 5; Session["UserShoppingCartInfo"] = new UserShoppingCart(); }

In addition to the links that are generated, the locale module provides a language switcher block that can be enabled under Structure -> Blocks. The language switcher block will show up only if multiple languages are enabled and the Detection and Selection setting is set to something other than Default. The language switcher block is shown in Figure 19-30.

Note If you do not need to tweak each user s Timeout value, you can alter the 20-minute default for all users via the Timeout attribute of the <sessionState> element within the Web.config file (examined at the end of this chapter).

The benefit of the Timeout property is that you have the ability to assign specific timeout values separately for each user. For example, imagine you have created a web application that allows users to pay cash for a given membership level. You may say that Gold members should time out within one hour, while Wood members should get only 30 seconds. This possibility begs the question, how can you remember user-specific information (such as the current membership level) if users close the browser and come back at a later time One possible answer is through the use of the HttpCookie type. (And speaking of cookies . . .)

One minor gotcha regarding named arguments is that if you begin to invoke a method using positional parameters, they must be listed before any named parameters. In other words, named arguments must always be packed onto the end of a method call. The following code is an example: // This is OK, as positional args are listed before named args. DisplayFancyMessage(ConsoleColor.Blue, message: "Testing...", backgroundColor: ConsoleColor.White); // This is an ERROR, as positional args are listed after named args. DisplayFancyMessage(message: "Testing...", backgroundColor: ConsoleColor.White, ConsoleColor.Blue); This restriction aside, you might still be wondering when you would ever want to use this language feature. After all, if you need to specify three arguments to a method, why bother flipping around their position Well, as it turns out, if you have a method that defines optional arguments, this feature can actually be really helpful. Assume DisplayFancyMessage() has been rewritten to now support optional arguments, as you have assigned fitting defaults: static void DisplayFancyMessage(ConsoleColor textColor = ConsoleColor.Blue, ConsoleColor backgroundColor = ConsoleColor.White, string message = "Test Message") { ... } Given that each argument has a default value, named arguments allows the caller to only specify the parameter(s) for which they do not wish to receive the defaults. Therefore, if the caller wants the value "Hello!" to appear in blue text surrounded by a white background, they can simply say: DisplayFancyMessage(message: "Hello!"); Or, if the caller wants to see Test Message print out with a green background containing blue text, they can invoke DisplayFancyMessage(): DisplayFancyMessage(backgroundColor: ConsoleColor.Green); As you can see, optional arguments and named parameters do tend to work hand in hand. To wrap up our examination of building C# methods, I need to address the topic of method overloading.

Figure 19-30. The language switcher block Let s get back to our discussion of source nodes and their translations. If a node is a source node, editing it will show an additional fieldset called Translation settings in the node editing form. This fieldset contains a single check box labeled Flag translations as outdated, as shown in Figure 19-31.