How do I register a dll

Open up the command window.
Go to Start | Run
Type in cmd
In the new dos window (for those of you that know dos), type in the regsvr32 [path and dll name]

So, it would look like this

regsvr32 c:\joe.dll

Excellent Linq resource for example linq statements

http://msdn.microsoft.com/en-us/vcsharp/aa336760.aspx#WhereSimple1