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When web developers need to store a large amount of state information, they face a confounding problem. They can use session state and ensure excellent performance for a small set of users, but they risk poor scalability for large numbers. Alternatively, they can use a database to store temporary session information. This allows them to store a large amount of session information for a long time (potentially weeks or months instead of mere minutes). However, it also slows performance because the database must be queried for almost every page request. The compromise involves caching. The basic approach is to create a temporary database record with session information and store its unique ID in session state. This ensures that the in-memory session information is always minimal, but your web page code can easily find the corresponding session record. To reduce the number of database queries, you ll also add the session information to the cache (indexed under the session identifier). On subsequent requests, your code can check for the session information in the cache first. If the information is no longer in the cache, your code can retrieve it from the database as a last resort. This process becomes even more transparent if you create a custom component that provides the session information and performs the required cache lookup for you. For more information, read about custom components in 22, and caching in 23.

Returns an array of DirectoryInfo objects that represent all the subdirectories contained in this directory. Returns an array of FileInfo objects that represent all the files contained in this directory.

You configure session state through the web.config file for your current application (which is found in the same virtual directory as the .aspx web page files). The configuration file allows you to set advanced options such as the timeout and the session state mode. The following listing shows the most important options that you can set for the <sessionState> element. Keep in mind that you won t use all of these details at the same time. Some settings apply only to certain session state modes, as you ll see shortly. < xml version="1.0" > <configuration> <system.web> <!-- Other settings omitted. --> <sessionState cookieless="UseCookies" cookieName="ASP.NET_SessionId" regenerateExpiredSessionId="false" timeout="20" mode="InProc" stateConnectionString="tcpip=127.0.0.1:42424" stateNetworkTimeout="10" sqlConnectionString="data source=127.0.0.1;Integrated Security=SSPI"

Directory DirectoryName Length CopyTo()

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sqlCommandTimeout="30" allowCustomSqlDatabase="false" customProvider="" compressionEnabled="false" /> </system.web> </configuration> The following sections describe the most important session state settings.

PHP has several types of comments. Single-line comments are declared like this: //This is an inline comment Multiline comments have the following form: /* This is a multiline comment and may span many lines */ A third form is known as a doccomment, which is declared like this: /** This is a doccomment, which is also often called a docblock */ The two latter forms might look similar, but they have different parsing implications to PHP. The first form is just human-readable information that is not meaningful to PHP. The second form does something extra: it stores the data of the comment along with the program code, and this data may be used by other applications to get more information about how they should interact with your program. Let s take a closer look at how doccomments work.

Returns a DirectoryInfo object that represents the parent directory. Returns a string that identifies the name of the parent directory. Returns a Long (64-bit integer) with the file size in bytes. Copies a file to the new path and file name specified as a parameter. It also returns a new FileInfo object that represents the new (copied) file. You can supply an optional additional parameter of True to allow overwriting.

You can set the cookieless setting to one of the values defined by the HttpCookieMode enumeration, as described in Table 8-2. Table 8-2. HttpCookieMode Values

Cookies are always used, even if the browser or device doesn t support cookies or they are disabled. This is the default. If the device does not support cookies, session information will be lost over subsequent requests, because each request will get a new ID. Cookies are never used, regardless of the capabilities of the browser or device. Instead, the session ID is stored in the URL. ASP.NET chooses whether to use cookieless sessions by examining the BrowserCapabilities object. The drawback is that this object indicates what the device should support it doesn t take into account that the user may have disabled cookies in a browser that supports them. ASP.NET attempts to determine whether the browser supports cookies by attempting to set and retrieve a cookie (a technique commonly used on the Web). This technique can correctly determine whether a browser supports cookies but has them disabled, in which case cookieless mode is used instead.

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