Hello, Megetron A, and welcome to the chatbots.org forums.
There’s a fairly comprehensive list of AIML interpreters at http://www.alicebot.org/downloads/programs.html that you may be interested in looking at. I’m not certain if any of them will be of much use, since I don’t think that any are written in C# specifically. There are a couple that are in C++, and one called Program# that’s written using the .NET Framework, that you may find useful. Also, if you have your own web server and MySQL database, Program O might just work for you, if you’re familiar with PHP/MySQL.
I’d also like to respectfully suggest that both using your real name, and uploading an image of yourself will go a long way towards improving your experience here, as will filling out your user information page, so that we can get to know you a little better and learn which aspects of chatbots and AI you have interest in. The community here is filled with very friendly/helpful people, who are passionate about AI and chat bots, but we also like to know who we’re dealing with. Of course, none of this is a “requirement”, but it will help us to better know how best to help you with any questions you might have.