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Freezing the Current Shared Assembly

To illustrate how to dynamically bind to a specific version of a shared assembly, open Windows

Explorer and copy the current version of the compiled CarLibrary project (1.0.0.0) into a distinct

subdirectory (I called mine “CarLibrary Version 1.0.0.0”) to symbolize the freezing of this version

(see Figure 15-24).

Figure 15-24.

Freezing the current version of CarLibrary.dll

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8849CH15.qxd  10/22/07  1:46 PM  Page 512

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Building Shared Assembly Version 2.0.0.0

Now, open your existing CarLibrary project and update your code base with a new enum named

MusicMedia that defines four possible musical devices:

// Holds source of music.

public enum MusicMedia

{

musicCd,

musicTape,

musicRadio,

musicMp3

}

As well, add a new public method to the Car type that allows the caller to turn on one of the

given media players (be sure to import the System.Windows.Forms namespace within Car.cs if

necessary):

public abstract class Car

{

...

public void TurnOnRadio(bool musicOn, MusicMedia mm)

{

if(musicOn)

MessageBox.Show(string.Format("Jamming {0}", mm));

else

MessageBox.Show("Quiet time...");

}

...

}

Update the constructors of the Car class to display a MessageBox that verifies you are indeed

using CarLibrary 2.0.0.0:

public abstract class Car

{

...

public Car()

{

MessageBox.Show("CarLibrary Version 2.0!");

}

public Car(string name, short max, short curr)

{

MessageBox.Show("CarLibrary Version 2.0!");

petName = name; maxSpeed = max; currSpeed = curr;

}

...

}

Finally, before you recompile, be sure to update this version of this assembly to 2.0.0.0 by

updating the value passed to the [AssemblyVersion] attribute: