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The state module is responsible for retrieving the session state and attaching it to the context of each request that runs within the session. The session state is available only after the HttpApplication.AcquireRequestState event fires, and it gets irreversibly lost after the HttpApplication.ReleaseRequestState event. Subsequently, this means that no state is still available when Session_End fires. The session module creates the HttpSessionState object for a request while processing the HttpApplication.AcquireRequestState event. At this time, the HttpSessionState object a sort of collection is given its session ID and the session dictionary. The session dictionary is the actual collection of state values that pages will familiarly access through the Session property. If a new session is being started, such a data dictionary is simply a newly created empty object. If the module is serving a request for an existing session, the data dictionary will be filled by deserializing the contents supplied by the currently active session state provider. At the end of the request, the current content of the dictionary, as modified by the page request, is flushed back to the state provider through a serialization step. The whole process is depicted in Figure 17-1.

So when your Web page makes a call into the Session property, it s actually accessing a local, in-memory copy of the data. What if other pages (in the same session) attempt to concurrently access the session state In that case, the current request might end up working on inconsistent data or data that isn t up to date. To avoid that, the session state module implements a reader/writer locking mechanism and queues the access to state values. A page that has session-state write access will hold a writer lock on the session until the request finishes. A page gains write access to the session state by setting the EnableSessionState attribute on the @Page directive to true. A page that has session-state read access for example, when the EnableSessionState attribute is set to ReadOnly will hold a reader lock on the session until the request finishes.

Structure MyStructure <MarshalAs(UnmanagedType.LPStr)> Public f1 As String <MarshalAs(UnmanagedType.ByValTStr, SizeConst:=256)> Public f2 As String End Structure

If a page request sets a reader lock, other concurrently running requests cannot update the session state but are allowed to read. If a page request sets a writer lock on the session state, all other pages are blocked regardless of whether they have to read or write. For example, if two frames attempt to write to Session, one of them has to wait until the other finishes. Figure 17-2 shows the big picture.

Here s another example that uses the SizeConst optional argument:

FIGURE 17-2 Page access to the session state is synchronized, and a serialization/deserialization layer ensures that each request is served an up-to-date dictionary of values, stored at the application s convenience.

Structure Employee Marshal the Name string as an ANSI fixed-length string of 100 chars. (We must account for the extra null character.) <MarshalAs(UnmanagedType.ByValTStr, SizeConst:=101)> _ Dim Name As String End Structure

you have a multiframe page or if your users work with two copies of the same page or multiple pages of the same application at the same time. It also happens when you use session-enabled HTTP handlers to serve embedded resources such as images or cascading style sheet (CSS) files. By default, you are protected against concurrent accesses. However, declaring the exact use of the session state that a page is going to make (read/write, readonly, or no use) is an excellent form of optimization. You do this through the EnableSessionState attribute on the @Page directive.

The Dataset dialog box looks like this:

Visual Basic .NET defines a couple of attributes that let you control how the elements of a Structure block are arranged in memory and how the runtime should marshal them when they re passed to a function in an external DLL. Fields of a structure are arranged in memory in the order in which they appear in source code, even though the compiler is free to insert padding bytes to arrange members so that 16-bit values are aligned with word boundaries, 32-bit values are aligned with doubleword boundaries, and so on. This arrangement known as an unpacked layout delivers the best performance because Intel processors work faster with aligned data. Visual Basic .NET lets you finely control where each member of the structure or the class is located by means of the StructLayout attribute. The allowed values for this attribute are StructLayout.Auto (the compiler can reorder elements for best performance for example, by grouping value types together), StructLayout.Sequential (elements are laid out and properly aligned sequentially in memory), and StructLayout.Explicit.

The HttpSessionState class is defined in the System.Web.SessionState namespace. It is a generic collection class and implements the ICollection interface. The properties of the HttpSessionState class are listed in Table 17-5.

Part VII:

TABLE 17-5