Need app's bugs fixed, and a new feature added.(repost)

I need my app's bugs fixed. The app is written in C#, and I have the source code. There's some minor bugs to be fixed, and I want to add 1 new feature. The project is private, so I will explain what the app does, and the changes I need within PMs. The app works directly with the search engines, and uses proxies, is multi-threaded. So please only bid if you're familiar with this. Thanks, Nick