Creating a console app that writes line of output and exits upon Ctrl+C

I want to create a Console app that outputs a 'summary statement' as the last line of output, when it is terminated using <kbd>Ctrl+C</kbd>, but I'm having trouble getting this working. This may be in part due to app I'm trying to create is constantly writing output in a while(true) loop. I can best illustrate the problem with an simple example:

Let's say I have a console app that constantly outputs the current time:

while (true)
{
    var now = DateTime.Now;
    Console.Write(now);
    Console.Write(" ");
    Console.Write(now.Millisecond);
    Console.CursorLeft = 0; // Overwrite the same line
}

This works and I can terminate the app with <kbd>Ctrl+C</kbd>:

23/02/2023 23:07:14 658

Now when I press <kbd>Ctrl+C</kbd> I want the text Goodbye! displayed as the final line of output:

23/02/2023 23:09:56 441
Goodbye!

However, I'm having trouble getting this working. Here's my first attempt:

Console.CancelKeyPress += OnCancel;

while (true)
{
    var now = DateTime.Now;
    Console.Write(now);
    Console.Write(" ");
    Console.Write(now.Millisecond);
    Console.CursorLeft = 0; // Overwrite the same line
}

void OnCancel(object? sender, ConsoleCancelEventArgs e)
{
    Console.WriteLine("Goodbye");
}

However, this results 'garbled' output, for example:

Goodbye023 23:14:55 670
23/02/2023 23:14:55

I think this is happening because the Console.CancelKeyPress event handler is executed on a separate worker thread and the call to Console.WriteLine("Goodbye"); can happen at any point within the while loop. Ideally the CancelKeyPress event handler isn't ran until current iteration of the while loop is finished. I'm not sure how to do this in a thread-safe way.

I've tried different approaches, and I won't listed code for them, but in summary all of the following I've tried to no avail:

1. Defined a boolean variable cancelRequested in the top scope and set while
   loop condition to !cancelRequested; In OnCancel set the var to true;
   Console.WriteLine("Goodbye!") after the loop. This blocks on the
   Console.WriteLine("Goodbye!") line (deadlock?).
2. Similar to above but used CancellationTokenSource instead of a boolean variable.
   Same deadlock behavior is observed, so I guess this is equivalent?

As pointed out by @NetMage in the comments, my first attempt to solve the issue with the garbled text using a boolean variable was not working because normally pressing <kbd>Ctrl+C</kbd> terminates the app at the end of the CancelKeyPress and hadn't realised that I need to supress the default behavior by setting ConsoleCancelEventArgs.Cancel to true. Now that I know this, I have a working solution:

Console.CancelKeyPress += OnCancel;
bool cancelRequested = false;

while (!cancelRequested)
{
    var now = DateTime.Now;
    Console.Write(now);
    Console.Write(" ");
    Console.Write(now.Millisecond);
    Console.CursorLeft = 0; // Overwrite the same line
}
    
Console.WriteLine();
Console.WriteLine("Goodbye");

void OnCancel(object? sender, ConsoleCancelEventArgs e)
{
    e.Cancel = true;        // Stops cancel key press from terminating the app
    cancelRequested = true; // Signal the main loop the request to cancel
}