Code:
YouTubeRequestSettings settings = new YouTubeRequestSettings("Commenter", "AI39si5aomSV1_sa-VaAU3Wu6tvRAPvclkzaxaoJY2taVz5pE30mDMf_LUYO69z148z4wFpoTHAGYuDEMMissRKCTgZJ0_oYDA"); YouTubeRequest request = new YouTubeRequest(settings); Comment c = new Comment(); c.Content = "This is my comment."; Video video = new Video(); video.VideoId = "http://gdata.youtube.com/feeds/api/videos/sKZYVcuSITA"; request.AddComment(video, c);