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There comes a point in the life of most applications when they begin to have more sophisticated storage requirements. An application might need to store and access complex information such as custom data objects, which can t be easily persisted to a cookie or sent through a query string. Or the application might have stringent security requirements that prevent it from storing information about a client in view state or in a custom cookie. In these situations, you can use ASP.NET s built-in session state facility. Session state management is one of ASP.NET s premiere features. It allows you to store any type of data in memory on the server. The information is protected, because it is never transmitted to the client, and it s uniquely bound to a specific session. Every client that accesses the application has a different session and a distinct collection of information. Session state is ideal for storing information such as the items in the current user s shopping basket when the user browses from one page to another.

ASPNET tracks each session using a unique 120-bit identifier ASPNET uses a proprietary algorithm to generate this value, thereby guaranteeing (statistically speaking) that the number is unique and it s random enough that a malicious user can t reverse-engineer or guess what session ID a given client will be using This ID is the only piece of session-related information that is transmitted between the web server and the client When the client presents the session ID, ASPNET looks up the corresponding session, retrieves the objects you stored previously, and places them into a special collection so they can be accessed in your code This process takes place automatically For this system to work, the client must present the appropriate session ID with each request You can accomplish this in two ways: Using cookies: In this case, the session ID is transmitted in a special cookie (named ASP.

NET_SessionId), which ASPNET creates automatically when the session collection is used This is the default, and it s also the same approach that was used in earlier versions of ASP Using modified URLs: In this case, the session ID is transmitted in a specially modified (or munged) URL This allows you to create applications that use session state with clients that don t support cookies Session state doesn t come for free Though it solves many of the problems associated with other forms of state management, it forces the server to store additional information in memory This extra memory requirement, even if it is small, can quickly grow to performance-destroying levels as hundreds or thousands of clients access the site In other words, you must think through any use of session state.

) ), 'date'=>array( 'rule'=>'date', 'required'=>true, 'message'=>'You must supply a valid date' ), 'content'=>array( 'required'=>true ) );

A careless use of session state is one of the most common reasons that a web application can t scale to serve a large number of clients Sometimes a better approach is to use caching, as described in 24..

You can interact with session state using the System.Web.SessionState.HttpSessionState class, which is provided in an ASP.NET web page as the built-in Session object. The syntax for adding items to the collection and retrieving them is basically the same as for adding items to a page s view state. For example, you might store a DataSet in session memory like this: Session("InfoDataSet") = dsInfo You can then retrieve it with an appropriate conversion operation: dsInfo = CType(Session("InfoDataSet"), DataSet)

his appendix briefly summarizes some common Excel data analysis functions for analyzing statistical, mathematical, and financial data.

Session state is global to your entire application for the current user. However, session state can be lost in several ways: If the user closes and restarts the browser. If the user accesses the same page through a different browser window, although the session will still exist if a web page is accessed through the original browser window. Browsers differ on how they handle this situation. If the session times out due to inactivity. More information about session timeout can be found in the configuration section. If your web page code ends the session by calling the Session.Abandon() method. In the first two cases, the session actually remains in memory on the web server, because ASP.NET has no idea that the client has closed the browser or changed windows. The session will linger in memory, remaining inaccessible, until it eventually expires. Table 7-1 describes the methods and properties of the HttpSessionState class.