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

        private void PushParsingState()
        {
            if (_parsingStatesStack == null)
            {
                _parsingStatesStack = new ParsingState[InitialParsingStatesDepth];
                Debug.Assert(_parsingStatesStackTop == -1);
            }
            else if (_parsingStatesStackTop + 1 == _parsingStatesStack.Length)
            {
                ParsingState[] newParsingStateStack = new ParsingState[_parsingStatesStack.Length * 2];
                Array.Copy(_parsingStatesStack, 0, newParsingStateStack, 0, _parsingStatesStack.Length);
                _parsingStatesStack = newParsingStateStack;
            }
            _parsingStatesStackTop++;
            _parsingStatesStack[_parsingStatesStackTop] = _ps;

            _ps.Clear();
        }