System.Xml.XmlTextReaderImpl.AddAttribute C# (CSharp) Method

        private NodeData AddAttribute(int endNamePos, int colonPos)
        {
            // setup attribute name
            if (colonPos == -1 || !_supportNamespaces)
            {
                string localName = _nameTable.Add(_ps.chars, _ps.charPos, endNamePos - _ps.charPos);
                return AddAttribute(localName, string.Empty, localName);
            }
            else
            {
                _attrNeedNamespaceLookup = true;
                int startPos = _ps.charPos;
                int prefixLen = colonPos - startPos;
                if (prefixLen == _lastPrefix.Length && XmlConvert.StrEqual(_ps.chars, startPos, prefixLen, _lastPrefix))
                {
                    return AddAttribute(_nameTable.Add(_ps.chars, colonPos + 1, endNamePos - colonPos - 1),
                                         _lastPrefix,
                                         null);
                }
                else
                {
                    string prefix = _nameTable.Add(_ps.chars, startPos, prefixLen);
                    _lastPrefix = prefix;
                    return AddAttribute(_nameTable.Add(_ps.chars, colonPos + 1, endNamePos - colonPos - 1),
                                         prefix,
                                         null);
                }
            }
        }