Although C# markup for Xamarin.Forms has been available since Xamarin.Forms 4.6 ... "C# Markup helps developers write concise declarative UI markup and cleanly separate it from UI logic, all in C#.

Proving that Visual Studio tools can come from all manner of sources ... the Web (click on the magic wand icon), showing off sample HTML, forms, icons and a video presentation. The C# and VB source ...