I posted earlier an overview about the SQLCLR component of the SQL Server 2005, and showed how to implement a simple user-defined function using Visual Studio 2008 and C#, this post will show the importance of .NET Framework to SQLCLR by adding more functionality...
The source code of the .NET Framework libraries are available for developers visit: http://weblogs.asp.net/scottgu/archive/2007/10/03/releasing-the-source-code-for-the-net-framework-libraries.aspx