MainPage.*

//MainPage.idl
namespace NOVAStudent
{
    [default_interface]
    runtimeclass MainPage : Windows.UI.Xaml.Controls.Page
    {
        MainPage();
        Windows.Foundation.IAsyncAction on_myButton_clicked();
    }
}

//MainPage.xaml
<Page
    x:Class="NOVAStudent.MainPage"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="using:NOVAStudent"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d">

    <StackPanel Orientation="Horizontal" HorizontalAlignment="Center" VerticalAlignment="Center">
        <Button x:Name="myButton" Click="on_myButton_clicked">Click Me</Button>
    </StackPanel>
</Page>

//MainPage.h
#pragma once
#include "MainPage.g.h"
namespace winrt::NOVAStudent::implementation
{
    struct MainPage : MainPageT<MainPage>
    {
        MainPage();
        IAsyncAction on_myButton_clicked(Windows::Foundation::IInspectable const& /*sender*/, Windows::UI::Xaml::RoutedEventArgs const& /*args*/);
    };
}

//ConnectTask.h
#pragma once
#include "pch.h"
using namespace winrt::Windows::Foundation;
namespace Tasks
{
    class ConnectTask
    {
    public:
        static IAsyncOperation<bool> RunAsync()
        {
            co_await resume_background();

            return false;
        }
    };
}

//MainPage.cpp
#include "pch.h"
#include "MainPage.h"
#include "MainPage.g.cpp"
#include "ConnectTask.h"
using namespace winrt;
using namespace Windows::UI::Xaml;
using namespace Tasks;
namespace winrt::NOVAStudent::implementation
{
    MainPage::MainPage()
    {
        InitializeComponent();
    }
    IAsyncAction MainPage::on_myButton_clicked(IInspectable const&, RoutedEventArgs const&)
    {
        myButton().Content(box_value(co_await ConnectTask::RunAsync() ? L"Not connected" : L"Connected"));
    }
}