create windows service

Following posts are really good.. specially first one.
http://mukarrammukhtar.wordpress.com/creation-deployment-of-windows-service-in-net/
http://www.beansoftware.com/NET-Tutorials/Create-Windows-Services.aspx

ParameterizedThreadStart Usage in C#

http://en.csharp-online.net/Building_Multithreaded_Applications%E2%80%94Working_with_the_ParameterizedThreadStart_Delegate

How to select random rows in SQL Server

In SQL Server its simple, just use order by newid()

Select * from tableName order by newid()