facebook api post to wall not working at server 400 bad request

I am trying to post request on the wall but facing a 400 Bad Request error.

I am using the following code:-

if (string.IsNullOrWhiteSpace(user.Facebook) || string.IsNullOrWhiteSpace(user.FacebookToken))
         {
             req.Status = (int)Notify.NotifyStatus.MissingAccount;
             db.SaveChanges();
             return false;
         }
 
         var address = "https://graph.facebook.com/" + user.Facebook + "/feed";
         var form = new System.Collections.Specialized.NameValueCollection();
         form.Add("access_token", user.FacebookToken);
         form.Add("message", "Connect6");
         form.Add("link", joburl);
         form.Add("description", description);
         form.Add("picture", picture);
 
 
 
         WebClient wc = new WebClient();
         wc.Headers.Add("Content-Type", "application/x-www-form-urlencoded");
         var responseBytes = wc.UploadValues(address, "POST", form);
         var page = Encoding.UTF8.GetString(responseBytes);
 
         req.Status = (int)Notify.NotifyStatus.Sent;
         db.SaveChanges();
         return true;
 

At response bytes it is giving me error

Please suggest

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