/// <summary>
/// Reads the next value as a NULL with a specified tag.
/// </summary>
/// <param name="expectedTag">The tag to check for before reading.</param>
/// <exception cref="CryptographicException">
/// the next value does not have the correct tag --OR--
/// the length encoding is not valid under the current encoding rules --OR--
/// the contents are not valid under the current encoding rules
/// </exception>
/// <exception cref="ArgumentException">
/// <paramref name="expectedTag"/>.<see cref="Asn1Tag.TagClass"/> is
/// <see cref="TagClass.Universal"/>, but
/// <paramref name="expectedTag"/>.<see cref="Asn1Tag.TagValue"/> is not correct for
/// the method
/// </exception>
public void ReadNull(Asn1Tag expectedTag)
{
AsnValueReader valueReader = OpenValueReader();
valueReader.ReadNull(expectedTag);
valueReader.MatchSlice(ref _data);
}