vb net barcode component The My Namespace and Assemblies | in VB.NET

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The My Namespace and Assemblies |
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The My namespace includes a lot of features you will use regularly, including access to the version number of the application. Instead of typing System.Reflection.whatever to get to the version number s major component, you can now just type:
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My.Application.Info.Version.Major
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Need a list of assemblies, but you re too lazy to type the word Reflection Try:
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My.Application.Info.LoadedAssemblies
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My.Computer.Clock.GmtTime
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My.Computer.Network.IsAvailable
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My.User.Name
There isn t much in the My namespace that you can t already do with standard FCLs. There are even a few parts of My that are repeats of features already included in the Visual Basic language, although with some enhancements. For instance, Visual Basic includes a Kill command that lets you delete files. The My.Computer.FileSystem. DeleteFile method also removes files, but it offers additional options, including one that lets you send the file to the Recycle Bin instead of just losing it forever.
Directives and Assemblies
Directives are Visual Basic statements but then again, they re not. The two key directives #Const and #If provide instructions to the compiler on how to handle a block of Visual Basic source code. (A third directive, #Region, helps to visually present source code within Visual Studio, but it has no impact on the compiler or the final compiled application.) By using directives, you can tell the compiler to include or exclude specific chunks of source code from the final project. So, they aren t really Visual Basic source code statements, but they are available only in Visual Basic. Why would you want to include or exclude code in an application Well, I can think of several good reasons, some of which involve the CIA and former Federal Reserve chairman Alan Greenspan. But the most common use is when you want to produce two different versions of your application, based on some condition. For example, you may sell an express version and a professional version of a product. Much of the code is identical for the two versions, but the professional version would include features not available in the express version. Also, the express version may include a simplified presentation for a feature that has a more complex usage in the professional edition.
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5: .NET Assemblies
Some software products fulfill this need by using standard Visual Basic conditions.
If (professionalVersion = True) Then ShowWhizBangFeatures( ) Else ShowLaughableFeatures( ) End If
This, of course, works just fine. But the express application still contains all the enhanced features. Since it can t access any of that code, why even include it on the installation CD If you use directives, you can mark down that problem as solved. Directives use conditional expressions, much like the professionalVersion = True condition in the preceding block of code. But they are defined with the #Const statement, and are called compiler constants.
#Const fullVersion = True
This statement defines a Boolean compiler constant. The constant can be used only with directives; if you try to use fullVersion in a standard Visual Basic statement, the compiler will complain. But it will work just fine in the #If directive.
#If (fullVersion = True) Then ShowWhizBangFeatures( ) #Else ShowLaughableFeatures( ) #End If
This code looks a lot like the previous code block, but with the added # signs. It looks the same but it s not. With the plain If statement, the following code gets compiled into the final application:
If (professionalVersion = True) Then ShowWhizBangFeatures( ) Else ShowLaughableFeatures( ) End If
Yeah, the whole block of code. But with the directives, what gets included in the compiled application depends on the value of fullVersion. If fullVersion is True, this gets compiled into the compiled application:
ShowWhizBangFeatures( )
The other four lines are gone; they ve vanished...into thin air, as though they never existed. But in this case, it s a good thing. The goal was to have a version of the assembly completely devoid of the undesired code, and that s what happened. To set the fullVersion compiler constant to generate the full version, you include this line at the top of each source code file that includes conditional #If code blocks:
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