How to create a DLL in VB.NET?

Creating a DLL in VB.NET
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Start a project as Classlibray and add CODE
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Imports System.Windows.Forms
Public Class Class1

    Public Sub Main(ByVal ary() As Integer, ByVal ary_2() As Integer)
        'populate the array
        Dim i As Integer
        For i = 0 To ary.Length - 1
            ary_2(i) = ary(i) + 10
        Next i
       MessageBox.Show("10 has been added in each array element of ary1.")
    End Sub
End Class
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*** To use Messagebox in VB.NET DLL you have to:
Do this :  Project menu select "Add Reference".  and locate System.Windows.Forms, select it and press
OK button.
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Now bulid you get DLL file in the Debug or Release folder as per settings.

Also See : How to use DLL in VB.NETcreated in VB.NET