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Reusable code in Class Library and Forms

Posted on 2013-11-04
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I am creating an application which has multiple smaller applications (exe)s to make up the larger framework.  Can I use DLLs (Class Libraries in VB.NET?  When I work on one of the sub-applications how can I access a form's controls in another application.  The main example here would be the main application.  It basically resides in the background calling the other apps.
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Question by:Peter Allen
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by:Jerry Miller
ID: 39622890
Yes you can create class library and put any of the common methods there. To access them you simply have to add IMPORTS <library name> at the top of the page that needs to access the methods.
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Jacques Bourgeois (James Burger) earned 1400 total points
ID: 39623294
You can reference a Form in a dll or in a exe if you follow a few simple rules. For the sake of simplicity I will use dll, but everything I say here about dll also works with an exe.

By default, controls are defined as Friend, which means that can be used only from inside the project where they reside. Your main application being in another project than the dll, it would not be able to access the controls. If you want to be able to use a given control in your application, change its Modifier property to Public in the dll.

In the application, make sure that you reference the dll through Project...Add Reference.

You will then be able to work with anything that is declared Public in the dll: Public forms, Public modules, Public methods, Public controls.

For a form, in the application, instanciate your form dll, using the namespace of the dll followed by the name of the form. The namespace is the name of the dll by default, but can be changed in the dll project's Properties window, in the Application tab, as the Root namespace.

Dim frm as New YourDllNamespace.YourFormName
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by:Peter Allen
ID: 39624686
Thank you very much for the explanation.  Very clear.
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