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// SOURCE: http://blog.prabir.me/posts/facebook-csharp-sdk-uploading-video-via-graph-api

var fb = new FacebookClient("access_token");

dynamic parameters = new ExpandoObject();
parameters.source = new FacebookMediaObject { ContentType = "video/3gpp", FileName = "video.3gp" }.SetValue(File.ReadAllBytes(@"c:\video.3gp"));
parameters.title = "video title";
parameters.description = "video description";

dynamic result = fb.Post("/me/videos", parameters);
Console.WriteLine(result);