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Remember, if you make your web services publicly accessible, you must make sure they can t be easily abused. For example, you should never allow your web methods to return sensitive data or commit arbitrary changes. Even though you know your applications will use your web services properly, it s trivially easy for malicious users to create their own applications that don t. And even if your web service doesn t allow cross-domain access, it s a good idea to clamp down on your web methods as much as possible. Doing so prevents problems in a number of scenarios for example, if a website configuration change inadvertently grants cross-domain access to your web services, if an attacker gain access to your website, or if an attacker fools your application into performing a damaging operation. If you perform security checks in a cross-domain web service, remember that you can t trust cookies or any authentication information that s not a part of the actual request message. That s because trusted users can visit malicious applications and when they do, the malicious application gains access to their current cookies. To prevent issues like these, you can add checks and balances to your web service that look for improper usage for example, users who

Compound operators: Compound operators allow you to perform mathematical operations on a variable without having to reference the variable twice. Table 1-1 shows a sample of how you would use the new compound operator syntax along with the equivalent syntax prior to SQL Server 2008.

access more data than they should in a short period of time, or users who attempt to view or edit data that isn t directly related to them.

You implemented these as part of the requirement-gathering process. As you work through the remaining chapters in this book, you will probably think of ways these techniques can be employed to facilitate other project management activities.

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In 6, you learned how to create out-of-browser applications that can run outside of the browser window, even when no network connection is available Clearly, this raises the possibility that a user may run the application when the computer isn t online In this case, attempts to call a web service are bound to fail Dealing with this problem is easy As you ve already seen, a failed web service call causes the completed event to fire When you respond to this event and attempt to retrieve the result, an exception is thrown that notifies you of the problem (If the network connection is present but the Internet comes and goes, the completed event may not fire until the call times out On the other hand, if the computer is completely disconnected from the network, the completed event fires immediately.

Set @x+=1 Set @x-=1 Set @x*=2

Either way, you need to catch the exception and either ignore the problem or inform the user) Exception-handling code gives your application a basic line of defense However, if you have a client with intermittent connectivity, you may want to handle the issue more gracefully For example, you may want to pay attention to the network status in your application and selectively disable certain features when they re not available, saving the user from potential confusion or frustration This behavior is easy to implement using Silverlight s new network-monitoring support The network-monitoring feature consists of two extremely simple classes, both of which expose a single public member, and both of which are found in the SystemNetNetworkInformation namespace First, you can use the GetIsNetworkAvailable() method of the NetworkInterface class to determine whether the user is online.

Set @x = @x + 1 Set @x = @x 1 Set @x = @x * 2

In this chapter you ll enhance the Requirements list that you created in 2. First, you ll implement a way to score each requirement. This will provide a quantitative approach for determining which requirements should be implemented first. Then you ll add a feature to specify dependencies since some requirements will rely on other related requirements. With these enhancements you ll be able to more easily plan the project and decide which requirements are in scope.

Second, you can respond to the NetworkAddressChanged event of the NetworkChange class to determine when the network status (or IP address) changes Usually, you ll work in that order first use GetIsNetworkAvailable() to determine the network status, and handle NetworkAddressChanged to pick up any changes: public MainPage() { InitializeComponent(); // Watch for network changes NetworkChangeNetworkAddressChanged += NetworkChanged; // Set up the initial user interface CheckNetworkState(); } private void NetworkChanged(object sender, EventArgs e) { // Adjust the user interface to match the network state CheckNetworkState(); } private void CheckNetworkState() { if (NetworkInterfaceGetIsNetworkAvailable()).

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