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An alternative to the single-instance context mode would have been to store our state in a static field. This would share the data across all clients, which is what we need. But then we d be on our own for thread safety. The ConcurrencyMode property applies only to any particular instance of the service, so if you don t choose the single-instance mode, WCF will let different instances of your service execute simultaneously. In practice, real applications are likely to need to do their own thread synchronization. Here we re relying on clients making only one call at a time, which might work in a small, controlled example but is a risky thing to do if you don t completely trust your client machines. (Even with only one session at a time, a single client session could invoke multiple operations simultaneously.) You may be wondering why we didn t use ConcurrencyMode.Single, which enforces a completely strict one-at-a-time model. Unfortunately, that turns out to prevent you from calling back into clients while you re in the middle of handling a call from a client a blocking outbound call from a nonreentrant singlethreaded context presents an opportunity for deadlocks, so WCF forbids it.

Even with the EJB framework, you may face situations that need a custom solution for authentication and authorization. Consider, for example, data-driven authorization where the authorization check not only considers the identity of the user and the functionality being accessed, but also the data involved. Current EJB frameworks do not offer a good solution to these problems that demand flexibility.

The NotifyAfter property is designed for user interface clients that track the progress of the bulk operation. If you want your Windows Forms application to display a progress bar that tracks the operation, you can set NotifyAfter to a value greater than 1 for example, 1/10 of the estimated number of rows to pro-

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Beyond the list of server controls that mirror the HTML controls, there are a number of ASP server controls that don t have exact analogs in HTML We ve seen one family of these controls, the validator controls Another large family of controls is designed to make developing database-driven applications easier We ll postpone looking at these data controls until 9 Several other controls enable ASPNET developers to provide a richer user interface A simple example is the LinkButton control, a hyperlink-style button control A much more complicated control is the Calendar control Until now, one of the benefits that developers have had to leave behind when moving to Web applications is the DateTimePicker common control provided in Windows Although it s certainly possible to use client-side ActiveX controls to get a similar effect, using a client -side ActiveX control isn t practical for most developers of Internet applications.

What is to be purchased (a bag) Factory instructions for making a bag To display a photo Requests a bag to be made The bag

The Calendar ASPNET server control is a pure HTML solution to the problem of date selection in a Web page The Calendar control has attributes that are too numerous to list here; again, they re well documented in the MSDN.

4 . . Create a collection of ProductInfos (derive from the generic List class) . You can either have Visual Studio create the class for you, or you could add it directly to the ProductInfo .cs file . Write a constructor that adds some ProductInfo objects to the collection . They can be any kind of products . I m a guitar enthusiast, so I added a guitar to the product list you see here:

Example 5-3. Factory Method pattern example code (continued)

Because the fourth object s instance variables don t get set until after the object is created, the Building message has an empty name and the crew warning is triggered.

The rows with the NULL make it to the table, but the duplicate known value doesn t . Query the table by running the following code:

Williams, Laurie and Robert Kessler. Pair Programming Illuminated, Boston, Mass.: Addison Wesley, 2002. This book explains the detailed ins and outs of

session.createCriteria(User.class) .add( Restrictions.disjunction() .add( Restrictions.conjunction() .add( Restrictions.like("firstname", "G%") ) .add( Restrictions.like("lastname", "K%") ) ) .add( Restrictions.in("email", emails) ) );

Of course, you can use a CancellationTokenSource to cancel a Task . First, we must revise our Sum method so that it accepts a CancellationToken:

This syntax is good for fine-tuning, but building a large array or object in the first place can be tedious. The shorthand for creating a numerically indexed array is to use square braces, with the entries being written as a comma-separated list of values, thus:

If the network you select is secure and you haven t already entered its security key or passphrase, you ll be prompted to enter that information at this point, as shown in Figure 12-6 on the next page. (Note that Windows offers another opportunity to use a USB flash drive that has WLAN configuration settings.) After you successfully enter the key, you can begin using the shared internet connection and any available shared resources on the network.

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