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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.

{0:C} {0:E} {0:P} {0:F }

ASP.NET tracks each session using a unique 120-bit identifier. ASP.NET 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, ASP.NET 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.

$1,234.50. Brackets indicate negative values: ($1,234.50). The currency sign is locale-specific. 1.234.50E+004 45.6% Depends on the number of decimal places you set. {0:F3} would be 123.400. {0:F0} would be 123.

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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 ASP.NET creates automatically when the session collection is used. This is the default. 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. 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 23.

You can find other examples in the MSDN Help. For date or time values, you ll find an extensive list. For example, if you want to write the BirthDate value in the format month/day/ year (as in 12/30/08), you use the following column:

As mentioned earlier, you may want to use error codes to control pragmatic decisions. However, as your applications get larger, you will want to centralize the strings in the error messages so that they can be easily updated or even internationalized. There are literally dozens of ways you can achieve this, but they all share a common quality: mapping of the error code to a string. You can also create an exception-derived class that will make operating with coded exceptions easier. Listing 4-6 shows one of the simplest possible implementations of error coding.

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 = (DataSet)Session["InfoDataSet"]; Of course, before you attempt to use the dsInfo object, you ll need to check that it actually exists in other words, that it isn t a null reference. If the dsInfo is null, it s up to you to regenerate it. (For example, you might decide to query a database to get the latest data.)

<asp:BoundField DataField="BirthDate" HeaderText="Birth Date" DataFormatString="{0:MM/dd/yy}" /> Table 17-4 shows some more examples.

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