Private Sub buildEllipseAnnotationButton_Click(sender As Object, e As System.EventArgs)
    ' create the ellipse annotation data
    Dim ellipseAnnotationData As New Vintasoft.Imaging.Annotation.EllipseAnnotationData()
    ' create the ellipse annotation view
    Dim ellipseAnnotationView As Vintasoft.Imaging.Annotation.UI.EllipseAnnotationView = DirectCast(Vintasoft.Imaging.Annotation.UI.AnnotationViewFactory.CreateView(ellipseAnnotationData), Vintasoft.Imaging.Annotation.UI.EllipseAnnotationView)

    ' add annotation to the annotation collection of focused image and
    ' start building of annotation
    annotationViewer1.AddAndBuildAnnotation(ellipseAnnotationView)
End Sub

private void buildEllipseAnnotationButton_Click(object sender, System.EventArgs e)
{
    // create the ellipse annotation data
    Vintasoft.Imaging.Annotation.EllipseAnnotationData ellipseAnnotationData = 
        new Vintasoft.Imaging.Annotation.EllipseAnnotationData();
    // create the ellipse annotation view
    Vintasoft.Imaging.Annotation.UI.EllipseAnnotationView ellipseAnnotationView = 
        (Vintasoft.Imaging.Annotation.UI.EllipseAnnotationView)Vintasoft.Imaging.Annotation.UI.AnnotationViewFactory.CreateView(ellipseAnnotationData);

    // add annotation to the annotation collection of focused image and
    // start building of annotation
    annotationViewer1.AddAndBuildAnnotation(ellipseAnnotationView);
}