Minor fix to WriteLock class, and a quick hello.

Hello,

I wanted to send a quick thanks for your work on the .Net client and recipes -- you and the other contributors have already saved me a fair bit of time as I would have had to go down the same path myself.  This pull request contains a small fix for a bug in the WriteLock class that was leading to a null ref exception.  As I begin to use the library more and implement additional recipes and primitives for our own use, I'll send more pull requests to share them.

Thanks again,

Tyler