Hi ramco1917,
Use third-party libraries like Tweetinvi for Twitter or LinkedIn API Libraries for LinkedIn.
1. Install Tweetinvi package from NuGet.
2. Instantiate Twitter credentials.
TwitterCredentials userCredentials = new TwitterCredentials("CONSUMER_KEY", "CONSUMER_SECRET", "ACCESS_TOKEN", "ACCESS_TOKEN_SECRET");
var media = Upload.UploadVideo("path_to_video.mp4");
if (media != null)
{
var tweet = Tweetinvi.Tweet.PublishTweet("Test", new PublishTweetOptionalParameters
{
Medias = { media }
});
}