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Adding a namespace to a library is optional but highly recommended. Remember that all identifiers have to be unique in C++/CLI, at least within their own scope. When you develop code on your own, keeping identifiers unique should not be a problem. With careful coordination and a detailed naming convention, a small group of programmers can keep all their identifiers unique. However, with the addition of third-party source code, unique identifiers become increasingly harder to maintain. That is, unless namespaces are used. Namespaces create a local-scope declarative region for types. In other words, namespaces allow programmers to group code under a unique name. Thus, with a namespace, it is possible for programmers to create all types with any names they like and be secure in the knowledge that the types will be unique within the application if they are placed within a uniquely identified namespace. The basic syntax of a namespace is simply this: namespace name { // all types to be defined within the namespace }

As mentioned, the service is quite simple and exposes the interface called IQuickReturnQuoteService. Listing 11 15 shows this interface. The service also has two endpoints one is over HTTP and the other is a MEX endpoint. In this example, the service resides in a folder called wcf, which is part of inetpub and is located at C:\inetpub\wwwroot\wcf. Listing 11 15. IQuickReturnQuoteService Interface [ServiceContract] public interface IQuickReturnQuoteService { [OperationContract] StockQuote[] GetPortfolio(string[] portfolioTickers); [OperationContract] StockQuote GetQuote(string ticker); } The QuoteService class shown in Listing 11 16 is the concrete implementation for the IQuickReturnQuoteService interface for the service. Listing 11 16. QuoteService Concrete Implementation public class QuoteService : IQuickReturnQuoteService { public StockQuote[] GetPortfolio(string[] portfolioTickers) { ArrayList tickers = new ArrayList(); foreach (string stockTicker in portfolioTickers) { StockQuote stockQuote = new StockQuote(stockTicker); tickers.Add(stockQuote); } return (StockQuote[])tickers.ToArray(typeof(StockQuote)); } public StockQuote GetQuote(string ticker) { StockQuote quote = new StockQuote(ticker);

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Do the following: 1 In the User Name textbox enter Test User 1 (note that this user does not exist) 2 In the Password textbox enter password 3 Click Login 4 Stop recording the web test What should occur is that the login does not succeed and an error message is shown Now, if this test is run as it is, the test will succeed because no exceptions occurred However, that does not really help you In many cases you need to ensure that when an expected failure occurs (which is not triggered by throwing an exception), the correct actions are taken In order to do this you can add a Validation Rule To change this test to something more meaningful, the test will check to see if the words Invalid username or password (part of the error message if a login fails) are displayed in the resulting web page.

If you want a namespace called Test to provide local scope to the Square class defined previously, you would simply code it like this: namespace Test { public ref class Square { public: Square (int d); int Area(); private: int Dims; }; } Those of you with a traditional C++ background may have noticed the additional keyword public placed in front of the class declaration. C++/CLI handles namespaces differently from traditional C++. Types within a namespace have private access. Thus, to make the class accessible outside the namespace, it has to be declared public. In traditional C++, all types are public within a namespace. Personally, I don t like the new syntax, as it is inconsistent with C++. It should be public: (be careful, this is invalid syntactically), as it is in classes and structures. This syntax resembles C# and Java.

If you fail to make any of the classes within the namespace public, then the namespace will not be accessible and will generate an error when you attempt to use the using statement for the namespace.

Open the LoginFailurewebtest file and right-click the Loginaspx node (the last node in the node list) and select Add Validation Rule (validation rules are discussed in more detail later in this chapter in the section Validation Rules ) Click the Find Test validation rule and enter Invalid username or password for the Find Text property and click OK When it is run, the test will search for this text within the resulting HTML body If it finds the text, the test will pass; if it does not, it will fail This ensures that you are checking for a specific type of failure..

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