VB Example

Public Class Form1
    Dim s1Lib As Nel_S1Library.Nel_S1Library
    Dim s1 As IntPtr

    Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
        s1Lib = New Nel_S1Library.Nel_S1Library
        Try
            s1 = s1Lib.GetS1()
        Catch ex As Exception
            MessageBox.Show("Error: " & ex.Message)
        End Try
    End Sub
End Class