I want a c# code for my app that enables it to automatically detect apps installed and can automatically find out their path and can execute them on command. Thanks!

Alright :) In that case, if you haven't yet found a way to do it, I would suggest: Post a new question. Explain a bit more in detail what you want to achieve, what you've already tried (include the relevant parts of your code) and why it doesn't work like you want. If you haven't yet tried anything I would strongly suggest you to do so because questions that show that some effort has been made are much better received and more likely to get a good answer. Good luck :)