PostSharp is a platform that allows a .NET developer to transform or analyze .NET assemblies after compilation. It reads binary assemblies into memory, execute a suite of plug-ins and write back the modified code. PostSharp is a tool designed for Aspect-Oriented Programming (AOP/AOSD).
PostSharp Laos [Lightweight Aspect-Oriented System] allows .NET developers to author aspects just by deriving custom attributes. More advanced developers may use the low-level aspect weaver to directly inject MSIL instructions at join points.
postsharp
Gael-Fraiteur
License:MPL
License:LGPL
License:GPL
C#
.NET
Programming
tool
AOP
MsSqlSpatial – Spatial Extensions for SQL Server 2005.
MsSqlSpatial
License:LGPL
CLR
mssql
gis
C#
.NET
SQL
Server
Database

The FileHelpers are an easy to use .NET library written in C#. Is designed to read/write data from flat files with fixed length or delimited records (CSV). Also has support to import/export data from different data storages (Excel, Access, Sql Server)
The library has a set of converters for the basic types and can be easily extended to provide custom converters.
The Basic Idea:

Using the library with other DataStorages

filehelpers
Marcos-Meli
License:LGPL
Fixedlength
Delimited
flatfile
csv
C#
.NET
Library