How to display C# output in windows form richtextbox?

class JsonMain
   {
     public void JsonArr()
       {

           using (var webClient = new System.Net.WebClient())
           {
               string json = webClient.DownloadString("http://www.mywedjat.com/services/apis/get_doctor?id=2http://www.mywedjat.com/services/apis/login_api?email=darwin@mail.com&password=123456&mobile_type=ios&UDID=3454543");



               Console.WriteLine("-------------------------------------------------------------------------------------------");

               JObject json1 = JObject.Parse(json.ToString());
            // Console.WriteLine(json1);
               var tmp = JsonConvert.DeserializeObject<RootObject>(json);
               var successes = tmp.status.success;
               var specialityObjects = successes.Select(success => success.Speciality).ToList();
               var users = successes.Select(success => success.User).ToList();
               Console.WriteLine("-------------------------------------------------------------------------------------------");

               Console.WriteLine("Name: " + users[0].username + "\n" + "Email: " + users[0].email + "\n" + "Qualification: " + users[0].qualification + "\t");
               Console.WriteLine("-------------------------------------------------------------------------------------------");

               Console.WriteLine("Name: " + users[1].username + "\n" + "Email: " + users[1].email + "\n" + "Qualification: " + users[1].qualification + "\t");
               Console.WriteLine("-------------------------------------------------------------------------------------------");

               Console.WriteLine("Name: " + users[2].username + "\n" + "Email: " + users[2].email + "\n" + "Qualification: " + users[2].qualification + "\t");

               //Console.WriteLine(users[1].id + " " + users[1].username);
               //Console.WriteLine(users[2].id + " " + users[2].username);

               //Console.WriteLine(tmp.status.success[0].User);
               Console.WriteLine("-------------------------------------------------------------------------------------------");


               Console.ReadLine();
           }

       }


   }