Google is your friend: Be nice and visit him often. He can answer questions a lot more quickly than posting them here...
A very quick search gave 21 million hits:
socket programming - Google Search[
^] so start there, and refine your Google-fu to get the most relevant data for you.
For example, a simple refinement brings it down to 185,000 hits:
socket programming c# video conference[
^] with a wealth of materials.
In future, please try to do at least basic research yourself, and not waste your time or ours.