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

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