C# Code Parsers, mainly for SQL Parsing

.NET SQL Parser and Formatter Tool and SSMS Plugin : https://github.com/benlaan/sqlformat

Looks complicated but stable. uses Laan? algorithm.


SQL Parser on CodeProject : http://www.codeproject.com/Articles/32524/SQL-Parser
Looks interesting, has good explanation of the method used.

Gold Parser : http://goldparser.org/about/why-use-gold.htm
uses LALR algorithm, looks great and fast, simple to define languages.
Developed for .NET in Visual Basic.
Introduction in CodeProject : http://www.codeproject.com/Articles/10492/Introduction-to-GOLD-Parser
BSN-GoldParser https://code.google.com/p/bsn-goldparser/ : a project that uses GOLD parser . It builds a Sample Calculator here
There is a TSQL Parser based on the BSN project here
the above is based on a project for T-SQL Parsing by  Arsène von Wyss. C.f., found here 

ANTLR  : http://www.antlr.org/
Uses LL Algorith. Looks like it is the most used library. NHibernate used it for HSQL Parsing, I guess it was similar to HSQL in Java Hibernate.
This is developed by Terence Parr at the university of San Diego.

Grammatica : http://grammatica.percederberg.net/index.html
Uses LL Algorith, has Java and C# implemetation.