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Validation rules, as you have previously seen, can be used to test whether certain conditions on a web page are true once a response to a request has been made. In the previous example in the Data-Driven Web Testing section, the test validated that the system did return an error notification when a login failed. Likewise, it also validated that no error message was returned when a valid login occurred. To add a validation rule to a request, right-click the request in the Web Test window and select Insert Validation Rule. This brings up the dialog box shown in Figure 15-11.

TryGet(Message, ReceiveContext)

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Sometimes your program may catch an exception that it cannot completely resolve. In these cases, the program might want to rethrow the exception so that another catch block can resolve the exception. To rethrow an exception, simply add this statement within the catch block: throw; Once you rethrow the exception, exactly the same exception continues to make its way up the stack, looking for another catch block that matches the exception. Rethrowing an exception only works with nested try blocks. It will not be caught in a catch block at the same level as it was originally caught and thrown but instead will be caught in a catch block at a higher level. There is no limit on nesting try blocks. In fact, it is a common practice to have one try block that surrounds the entire program within the main() function and to have multiple try blocks surrounding other areas of the code where an exception has a higher probability of occurring. This format allows the program to catch and resolve exceptions close to where the exception occurred, but it still allows the program to catch other unexpected exceptions before the program ends, so that the program may shut down more gracefully. Listing 4-12 is a contrived example showing an exception being rethrown within nested try blocks. Of course, nesting try blocks immediately together like this doesn t make much sense.

Listing 4-12. RethrowException.exe: Rethrowing an Exception using namespace System; void main() { try { try { throw gcnew ApplicationException("\t***Boom***"); Console::WriteLine("Imbedded Try End"); } catch (ApplicationException ^ie) { Console::WriteLine("Caught Exception "); Console::WriteLine(ie->Message); throw; } Console::WriteLine("Outer Try End"); } catch (ApplicationException ^oe) { Console::WriteLine("Recaught Exception "); Console::WriteLine(oe->Message); }

Figure 15-11. Add Validation Rule dialog box The predefined validation rules are described in Table 15-8. Table 15-8. Predefined Validation Rules

You also add code to create a message, should one not exist. You create the host service as described in 4. Define the App.config file that specifies the service address and uses the standard NetMsmqBinding binding for TradeService. The code looks like Listing 8 7. Listing 8 7. TradeService NetMsmqBinding < xml version="1.0" encoding="utf-8" > <configuration xmlns="http://schemas.microsoft.com/.NetConfiguration/v2.0"> <system.serviceModel> <services> <service behaviorConfiguration="MyServiceTypeBehaviors" name="QuickReturns.TradeService"> <endpoint address="net.msmq://localhost/private/TradeQueue" binding="netMsmqBinding" bindingConfiguration="DomainlessMsmqBinding" contract="QuickReturns.ITradeService" /> <!-- Add the following endpoint. --> <!-- Note: your service must have an http base address to add this endpoint. -->

So far, you have only dealt with a single catch block associated with a try block. In reality, you can have as many catch blocks associated with a try block as there are possible exception classes that can be thrown by the try block. (Actually, you can have more, but catching exceptions that are not thrown by the try block is a waste of time and code.) Using multiple catch blocks can be a little trickier in C++/CLI than in traditional C++ because all exceptions are derived from a single class. The order in which the catch blocks are placed after the try block is important. For catch blocks to work properly in C++/CLI, the most-derived class must appear first and the least-derived class or the base class, System::Exception, must appear last.

Verifies that a field exists on the form and what the value in that field is Verifies that certain text appears somewhere in the response page Verifies that a request finishes in a given amount of time Verifies that a specified HTML tag exists in the response and contains an attribute with a given value Verifies that a specified HTML tag exists in the response

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