private void Button_Click_1(object sender, RoutedEventArgs e)
        {
            lgnForm w1 = new lgnForm();

            this.Close();
            w1.Show();
        }
        private void Button_Click(object sender, RoutedEventArgs e)
        {
            if (provera())
            {
                User newUser       = new User(Username, txtPassword.Password, Email);
                User encryptedUser = encrypt(newUser);

                users.Add(encryptedUser);
                parent.Users = users;


                using (StreamWriter file = File.CreateText(@"..\..\Users.json"))
                {
                    JsonSerializer serializer = new JsonSerializer();
                    serializer.Serialize(file, users);
                }

                this.Close();
                parent.Show();
            }
        }