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Building the Visual Basic Snap-In

Now, to simulate the role of a third-party vendor who prefers Visual Basic over C#, create a new

Visual Basic code library (VbNetSnapIn) that references the same external assemblies as the previ-

ous CSharpSnapIn project. The code is (again) intentionally simple:

Imports System.Windows.Forms

Imports CommonSnappableTypes

_

Public Class VbNetSnapIn

Implements IAppFunctionality

Public Sub DoIt() Implements CommonSnappableTypes.IAppFunctionality.DoIt

MessageBox.Show("You have just used the VB .NET snap in!")

End Sub

End Class

Notice that applying attributes in the syntax of Visual Basic requires angle brackets (< >) rather

than square brackets ([ ]). Also notice that the Implements keyword is used to implement interface

types on a given class or structure.

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