{\"meta\":{\"status\":401,\"msg\":\"Unauthorized\"},\"response\":[]}

[Nahush Shrestha]

    public async Task PostTumble()

        {

            

            var oauth = new Manager();

            oauth["consumer_key"] = "UgUNVzBrOWJ3ynIlyKWockrEtnN4tD6BQL8f3AkLuvOgkETkxc";

            oauth["consumer_secret"] = "rsDIF1XaKaD6kBS5kpdIW0a7u2fbCrSPPwwMJFyWzLHE0rCBfS";

            oauth["token"] = "05Dv6QDWeDCWUtipU1HLvltcAx5MUmrbAhGJ480C0dEyhzdiNj";

            oauth["token_secret"] = "Ek68in5wDBHkaIAbVLIOWHYPcc3g3yEXhk1EA1LGj1k7GmSVHD";

            // now, update tumblr status using that access token

            var appUrl = "https://api.tumblr.com/v2/blog/nahush/post";

            var authzHeader = oauth.GenerateAuthzHeader(appUrl, "POST");

           var abc = Encoding.UTF8.GetEncoder();

            using (var multiContent = new MultipartFormDataContent())

            {

            multiContent.Add(new StringContent(JsonConvert.SerializeObject("asjdgjahgds"), Encoding.UTF8, "application/x-www-form-urlencoded"), "body");

            using (HttpClient client = new HttpClient())

                {

                    client.BaseAddress = new Uri(appUrl);

                    client.DefaultRequestHeaders.Add("Authorization", authzHeader);

                    var data = await client.PostAsync("", multiContent);

                    var response = await data.Content.ReadAsStringAsync();

                }

               

            }

        }

errror {\"meta\":{\"status\":401,\"msg\":\"Unauthorized\"},\"response\":[]}

when i try to post something 

what is the solution for this