If you really aren't sure where to start, the best place is google:
Google: "live stream video c#"
] gives some results, including a video tutorial on one way to do it: http://www.youtube.com/watch?v=1LRdSS80QDM
That may not be ideal, but it should give you some ideas at least.
Try Google first: otherwise you just force us to google for you and that is a waste of your time and ours!