private void ParseInput(string input)
{
AntlrInputStream inputStream = new AntlrInputStream(input);
TSqlLexer sqlLexer = new TSqlLexer(inputStream);
CommonTokenStream commonTokenStream = new CommonTokenStream(sqlLexer);
TSqlParser sqlParser = new TSqlParser(commonTokenStream);
TSqlParserListenerExtended listener = new TSqlParserListenerExtended();
TSqlParser.ExpressionContext expressionContext = sqlParser.expression();
//TSqlVisitor visitor = new TSqlVisitor();
//visitor.Visit(expressionContext);
MessageBox.Show("Done");
}