class User
    {
       public String first_name;
        public String last_name;
        public String username;
        public String password;


    }


private void Next_Click(object sender, RoutedEventArgs e)
        {


            String name = nameTxtBox.Text;
            String lastName = textBoxSecondName.Text;
            String login = firstNameTxtBox.Text;
            String passwordt = lastNameTxtBox.Text;

            var client = new RestClient("http://95.85.24.237:8081");
            var request = new RestRequest("/user/new", Method.POST);
            request.RequestFormat = RestSharp.DataFormat.Json;
            request.AddBody(new User {
                first_name = name,
                last_name = lastName,
                username = login,
                password = passwordt,

    });

            IRestResponse response =  client.Execute(request);

            var content = response.Content;




            MessageBox.Show(content);
        }