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Source Code

The CarLibrary project is located under the Chapter 15 subdirectory.

Building a C# Client Application

Because each of the CarLibrary types has been declared using the public keyword, other assemblies

are able to make use of them. Recall that you may also define types using the C# internal keyword

(in fact, this is the default C# access mode). Internal types can be used only by the assembly in

which they are defined. External clients can neither see nor create types marked with the internal

keyword.

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Note

.NET does provides a way to specify “friend assemblies” that allow internal types to be consumed by a

set of specified assemblies. Look up the 

InternalsVisibleToAttribute

class in the .NET Framework 3.5 SDK

documentation for details.

To consume these types, create a new C# Console Application project (CSharpCarClient). Once

you have done so, set a reference to CarLibrary.dll using the Browse tab of the Add Reference dia-

log 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:

C H A P T E R   1 5  

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I N T R O D U C I N G   . N E T  A S S E M B L I E S

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using System;