private void btnAddNewUser_Click(object sender, System.Windows.RoutedEventArgs e) { if (!this._isNewUsernameValid()) { return; } if (!this._isNewUserPasswordValid()) { return; } if (!this._isNewUserConfirmationPasswordValid()) { return; } // validations done; let's create a new user account User user = new User(txtNewUserUsername.Text, txtNewUserPassword.Password); if (ConfigurationManager.AddUser(user)) { txtLoginUsername.Text = user.Username; pbLoginPassword.Password = ""; this.btnCancelAddNewUser_Click(sender, e); } else { MessageBox.Show("Unable to add the user to the system. Please, try again"); } }