n-tier
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sqlmap is an open source penetration testing tool that automates the process of detecting and exploiting SQL injection flaws and taking over of database servers.
sqlmap: automatic SQL injection tool
You can create n-tier or multitier applications that use LINQ to SQL. Typically, the LINQ to SQL data context, entity classes, and query construction logic are located on the middle tier as the data access layer (DAL). Business logic and any non-persistent data can be implemented completely in partial classes and methods of entities and the data context, or it can be implemented in separate classes.
N-Tier and Remote Applications with LINQ to SQL
Many thanks to RatFace for his article BBS style recursion How-To .