Как правильно использовать ConfigurationManager?

#include "stdafx.h"
#using <System.Configuration.dll>
 
using namespace System;
using namespace System::Configuration;
 
public ref class Program
{
private:
    System::Configuration::Configuration^ configFile;
    initonly String^ userNameSettingLabel = L"UserName";
public:
    String^ userName;
    String^ enteredName;
 
    Program() {
        LoadSettings();
    }
 
    void LoadSettings() {
        configFile = ConfigurationManager::OpenExeConfiguration(
            ConfigurationUserLevel::None);
        auto appSettings = ConfigurationManager::AppSettings;
        if (appSettings[userNameSettingLabel] != nullptr)
            userName = appSettings[userNameSettingLabel]->ToString();
        else
            userName = L"<No name>";
    }
 
    void SaveSettings() {
        auto settings = configFile->AppSettings->Settings;
        if (settings[userNameSettingLabel] == nullptr) {
            settings->Add(userNameSettingLabel, enteredName);
        }
        else {
            settings[userNameSettingLabel]->Value = enteredName;
        }
        configFile->Save(ConfigurationSaveMode::Modified);
        ConfigurationManager::RefreshSection(configFile->AppSettings->SectionInformation->Name);
    }
};
 
 
int main(array<System::String ^> ^args) {
    Program^ prog = gcnew Program();
 
    Console::WriteLine(L"Last user: {0}", prog->userName);
    Console::Write("Enter your name: ");
    prog->enteredName = Console::ReadLine();
    prog->SaveSettings();
    Console::WriteLine(L"Saved!");
 
    return 0;
}