TextNoteToUpper.cs

        public static global::Revit.Elements.Element ToUpper(global::Revit.Elements.Element textNote)
        {
            Autodesk.Revit.DB.Document doc = DocumentManager.Instance.CurrentDBDocument;
            Autodesk.Revit.DB.TextNote internalNote = (Autodesk.Revit.DB.TextNote)textNote.InternalElement;

            //Get the text from the text box
            //we obtain formatted text and modify the caps instead of the string. Preserves formatting.
            FormattedText formattedText = internalNote.GetFormattedText();
            formattedText.SetAllCapsStatus(true);
            //Change all the text to upper case and reassign to the text box
            //using formatted text allows for the formatting to stay - John
            TransactionManager.Instance.EnsureInTransaction(doc);
            internalNote.SetFormattedText(formattedText);
            TransactionManager.Instance.TransactionTaskDone();

            return textNote;
        }