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The .NET base class libraries define many classes that ultimately derive from System.Exception. For example, the System namespace defines core exception objects such as ArgumentOutOfRangeException, IndexOutOfRangeException, StackOverflowException, and so forth. Other namespaces define exceptions that reflect the behavior of that namespace. For example, System.Drawing.Printing defines printing exceptions, System.IO defines input/output-based exceptions, System.Data defines database-centric exceptions, and so forth. Exceptions that are thrown by the .NET platform are (appropriately) called system exceptions. These exceptions are regarded as non-recoverable, fatal errors. System exceptions derive directly from a base class named System.SystemException, which in turn derives from System.Exception (which derives from System.Object): public class SystemException : Exception { // Various constructors. } Given that the System.SystemException type does not add any additional functionality beyond a set of custom constructors, you might wonder why SystemException exists in the first place. Simply put, when an exception type derives from System.SystemException, you are able to determine that the .NET runtime is the entity that has thrown the exception, rather than the code base of the executing application. You can verify this quite simply using the is kis keyword: // True! NullReferenceException is-a SystemException. NullReferenceException nullRefEx = new NullReferenceException(); Console.WriteLine("NullReferenceException is-a SystemException : {0}", nullRefEx is SystemException);

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To use your library s functionality, create a new C# Console Application project named CSharpCarClient. Once you have done so, set a reference to CarLibrary.dll using the Browse tab of the Add Reference dialog box (if you compiled CarLibrary.dll using Visual Studio, your assembly is located under the \bin\Debug subdirectory of the CarLibrary project folder). At this point you can build your client application to make use of the external types. Update your initial C# file as follows: using using using using System; System.Collections.Generic; System.Linq; System.Text;

// Don't forget to import the CarLibrary namespace! using CarLibrary; namespace CSharpCarClient { public class Program { static void Main(string[] args) { Console.WriteLine("***** C# CarLibrary Client App *****"); // Make a sports car. SportsCar viper = new SportsCar("Viper", 240, 40); viper.TurboBoost(); // Make a minivan. MiniVan mv = new MiniVan(); mv.TurboBoost(); Console.ReadLine(); } } } This code looks just like the code of the other applications developed thus far in the text. The only point of interest is that the C# client application is now making use of types defined within a separate custom assembly. Go ahead and run your program. As you d expect, the execution of this program results in the display of various message boxes. It is important to point out that Visual Studio 2010 placed a copy of CarLibrary.dll into the \bin\Debug folder of the CSharpCarClient project folder. This can be verified by clicking the Show All Files button of the Solution Explorer (see Figure 14-10).

Entity tag HTTP response header; used for validating the cache When the feed was last modified, as a Unix timestamp Number of items to display in the feed s block

Figure 14-10. Visual Studio 2010 copies private assemblies to the client s directory As explained later in this chapter, CarLibrary.dll has been configured as a private assembly (which is the automatic behavior for all Visual Studio 2010 Class Library projects). When you reference private assemblies in new applications (such as CSharpCarClient.exe), the IDE responds by placing a copy of the library in the client application s output directory.

To illustrate the language-agnostic attitude of the .NET platform, let s create another Console Application (VisualBasicCarClient), this time using Visual Basic (see Figure 14-11). Once you have created the project, set a reference to CarLibrary.dll using the Add Reference dialog box, which can be activated by the Project Add Reference menu option.

The aggregator_item table stores the individual items imported from feeds. Table A-7. aggregator_item (aggregator module)

Figure 14-11. Creating a Visual Basic Console Application Like C#, Visual Basic requires you to list each namespace used within the current file. However, Visual Basic offers the Imports keyword rather than the C# using keyword, so add the following Imports statement within the Module1.vb code file: Imports CarLibrary Module Module1 Sub Main() End Sub End Module Notice that the Main() method is defined within a Visual Basic module type (which has nothing to do with a *.netmodule file for a multifile assembly). In a nutshell, modules are a Visual Basic notation for defining a class that can contain only static methods (much like a C# static class). In any case, to exercise the MiniVan and SportsCar types using the syntax of Visual Basic, update your Main() method as follows: Sub Main() Console.WriteLine("***** VB CarLibrary Client App *****") ' Local variables are declared using the Dim keyword. Dim myMiniVan As New MiniVan() myMiniVan.TurboBoost() Dim mySportsCar As New SportsCar() mySportsCar.TurboBoost() Console.ReadLine() End Sub

When you compile and run your application, you will once again find a series of message boxes displayed. Furthermore, this new client application has its own local copy of CarLibrary.dll located under the bin\Debug folder.

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