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The .NET Framework has an extensive set of exceptions that it may throw. You ll encounter two different types of exceptions while using .NET: ApplicationException SystemException System::ApplicationException is the base class of those exceptions that are user-defined or, in other words, the ones that you have defined yourself. System::SystemException, on the other hand, handles exceptions created within the CLR, for example, exceptions caused by stream I/O, databases, security, threading, XML, and so on. You can be sure that if the program has aborted as a result of a system problem, you can catch it using the generic System::SystemException. Both of these exceptions derive from the System::Exception class, which is the root of all .NET exceptions. The System::Exception class provides many useful properties (see Table 4-4) to help resolve any exceptions that might occur.

The Windows P2P networking stack is not installed on Windows XP by default. If you are running Windows XP with SP2, then perform the following steps to install the P2P networking stack: 1. 2. 3. 4. 5. Click Start Control Panel Add/Remove Programs. Click Add/Remove Windows Components. In Components, click Networking Services, and then select Details. Select the Peer-to-Peer check box, and then select OK. Click Next, and follow the instructions on the screen.

The Uniform Resource Name (URN) or Uniform Resource Locator (URL), if appropriate, to a help file providing more information about the exception. This property gives access to the exception that caused this exception, if any. A textual description of the error.

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To create a Context Parameter field, right-click the name of the test in the Web Test window (the root Tip node) or the Context Parameters folder, if it exists, and select Add Context Parameter. This creates a variable you can pass values to and read values from during the test.

The name of the object, assembly, or application that caused the exception. A text string of all the method calls on the stack made before triggering the exception. The name of the method that triggered the exception.

If you are running Windows XP with SP1, then you need to install the Windows Advanced Networking Pack for Windows XP, which is a free download available at http://www.microsoft.com/downloads/en/details.aspx FamilyId=E88CC382-8CE6-4739-97C01A52A6F005E4&displaylang=en. If you are running Windows Vista or later, then this is already installed; however, you might have to enable the firewall exceptions. To do so, follow these steps: 1. 2. 3. 4. 5. Click Start Control Panel Security. Under Windows Firewall, select Allow a Program Through Windows Firewall. Click the Exceptions tab. Check Windows Peer to Peer Collaboration Foundation. Click OK.

Custom extraction rules allow you to encapsulate logic and complex extraction processes. Take an example where a regular expression contains recursive groups. This can be a very complex regular expression to write. Or maybe your organization routinely performs a certain type of security test and you want to encapsulate the rules so they do not have to be rewritten for every application. These are good reasons to create a custom extraction rule. For this example, you will create a simple Extraction Rule that finds all of the telephone numbers, in the North American format (with variations) on a web page. Follow these steps to create the custom extraction rule: 1. Create a new code library called CustomExtractionRules (with either VB or CS appended to it for the example). 2. Add a reference to the Microsoft.VisualStudio.QualityTools.WebTestFramework.dll assembly. This assembly is located in the C:\Program Files\Microsoft Visual Studio 8\ Common 7\IDE\Public Assemblies folder. 3. Change the generated class (Class1) to TelephoneExtractionRule (rename the code file as well). 4. Add the following using or Imports statement to the top of the code file: using Microsoft.VisualStudio.TestTools.WebTesting.Rules; or, in VB, Imports Microsoft.VisualStudio.TestTools.WebTesting.Rules. 5. Change the class to inherit from the ExtractRegularExpression Rule class. 6. Implement (override) the RuleName and Extract methods (if needed) (see the code in Listing 15-3). 7. Build the solution.

You can t begin to explore all the exceptions that the .NET Framework class library provides to developers. Even the following illustration, which displays some of the more common exceptions, shows only the tip of the iceberg.

The .NET Framework provides developers with a huge set of classes. If something could go wrong, the .NET Framework class library provides an exception for it. As you can see from the preceding illustration, the names of the exceptions are self-explanatory, and if you add to them the properties mentioned previously, you have a great tool for finding where your application threw its exception and why.

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