Dicom.Data.DcmDataset.GetUN C# (CSharp) Method

        public DcmUnknown GetUN(DicomTag tag)
        {
            DcmElement elem = GetElement(tag);
            if (elem is DcmUnknown)
                return elem as DcmUnknown;
            if (elem != null)
                throw new DicomDataException("Tried to access element with incorrect VR");
            return null;
        }