static async Task UpdateProfileBannerAsync(TwitterContext twitterCtx) { byte[] fileBytes = File.ReadAllBytes(@"..\..\images\13903749474_86bd1290de_o.jpg"); var user = await twitterCtx.UpdateProfileBannerAsync( fileBytes, "13903749474_86bd1290de_o.jpg", "jpg", 1500, 500, 0, 0); if (user != null) Console.WriteLine("User Image: " + user.ProfileBannerUrl); }