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3 User A sets the current count to 433 4 User B sets the current count to 433 In other words, one request isn t counted because two clients access the counter at the same time To prevent this problem, you need to use the Lock() and Unlock() methods, which explicitly allow only one client to access the Application state collection at a time Protected Sub Page_Load(ByVal sender As Object, _ ByVal e As EventArgs) Handles MeLoad ' Acquire exclusive access ApplicationLock() Dim Count As Integer = CType(Application("HitCounterForOrderPage"), Integer) Count += 1 Application("HitCounter") = Count ' Release exclusive access ApplicationUnlock() lblCounterText = CountToString() End Sub Unfortunately, all other clients requesting the page will be stalled until the Application collection is released This can drastically reduce performance Generally, frequently modified values are poor candidates for application state In fact, application state is rarely used in the .

NET world because its two most common uses have been replaced by easier, more efficient methods: In the past, application state was used to store application-wide constants, such as a database connection string As you saw in 5, this type of constant can be stored in the webconfig file, which is generally more flexible because you can change it easily without needing to hunt through web page code or recompile your application Application state can also be used to store frequently used information that is timeconsuming to create, such as a full product catalog that requires a database lookup However, using application state to store this kind of information raises all sorts of problems about how to check whether the data is valid and how to replace it when needed It can also hamper performance if the product catalog is too large.

24 introduces a similar but much more sensible approach storing frequently used information in the ASPNET cache Many uses of application state can be replaced more efficiently with caching..

Processes are usually if not always dispatched to the controller Here, the View action is processed by the controller, and the corresponding view file will be called when the process terminates The first step of the action is to receive any parameters supplied by the user Because this is a simple page request sequence, all the user is going to supply is one or two variables that match a record in the database no form data, no complicated logic tests, just a couple of parameters at most Line 1 in Listing 6-1 receives the parameter supplied by the user with the function variable $id This variable is defaulted to null but could very well be changed to an array or have a default value, depending on your application s needs.

9. Click the Scenario Name box, and then type Rectangular Box. 10. Click OK. 11. Type 5 in the first box, 8 in the second box, and 7 in the third box. 12. Click OK. 13. In the Scenarios list, click Cube, and then click Show. Watch the values change in cells B1 through B4. 14. In the Scenarios list, click Rectangular Box, and then click Show. Watch the values change again in cells B1 through B4. 15. Click Close.

Figure 9-11 Configuring a web application in IIS 7 3 The first piece of information you need to supply is the alias the name a remote client will use to access the files in this virtual directory For example, if your alias is MyApp and your computer is MyServer, you can request pages using URLs such as http:// MyServer/MyApp/MyPageaspx 4 Choose a directory The directory is the physical directory on your hard drive that will be exposed as a virtual directory For example, c:\Inetpub\wwwroot is the physical directory that is used for the root virtual directory of your web server IIS will provide access to all the allowed file types in this directory 5 If you re using IIS 5 or IIS 6, there s one more step You need to choose the permissions for your virtual directory To host an ASP.