I'm iterating through the annotations on a document for the Text Annotations. So far I'm able to determine if each annotation is a Text Annotation, but I'd like to be able to get the text of the annotation. How can I do that? Here is the code I have so far.

using (DocumentInfo di = new DocumentInfo(BoundEntryId,RASession))
{
     List<AnnotationBase> anns = (List<AnnotationBase>)di.GetAnnotations();
     foreach(AnnotationBase ann in anns)
     {
          if (ann.AnnotationType == AnnotationType.TextBox )
          {

          }
     }
}