C# Tutorial: Asynchronous UI Programming

[BillWagner]

This issue tracks the creation of this topic: https://github.com/donet/core-docs/docs/csharp/tutorials/asynchronous-ui-programming.md

This tutorial should explain techniques for starting asynchronous tasks, monitoring those tasks, and updating the UI when those tasks complete.

Techniques for using the ICommand interface with asynchronous work should be explored.

Consider ValueTask, and caching completed Task results. Make sure to cover why async void is bad, and how to avoid using it in UI based scenarios.

[BillWagner]

This issue has been closed as part of the issue backlog grooming process outlined in #22351.

That automated process may have closed some issues that should be addressed. If you think this is one of them, reopen it with a comment explaining why. Tag the @dotnet/docs team for visibility.