Public Class Class1

    public Function hello() As String

        Return "hi there~ I'm VB"

    End Function

End Class

Imports example_VBdll

Imports example_CSharpDll

Public Class Form1

    Private Sub Button1_Click( sender As Object,  e As EventArgs) Handles Button1.Click

        Dim dllVB As New example_VBdll.Class1

        Console.WriteLine(dllVB.hello())

        Dim dllCS As New example_CSharpDll.Class1

        Console.WriteLine(dllCS.hello())

    End Sub

End Class