https://www.w3schools.com/TAGS/ev_ondragenter.asp
HTML ondragenter Event Attribute
Well organized and easy to understand Web building tutorials with lots of examples of how to use HTML, CSS, JavaScript, SQL, Python, PHP, Bootstrap, Java, XML...
htmleventattribute
https://learn.microsoft.com/it-it/dotnet/api/system.windows.forms.control.ondragenter?view=windowsdesktop-10.0
Control.OnDragEnter(DragEventArgs) Metodo (System.Windows.Forms) | Microsoft Learn
Genera l'evento DragEnter.
windows formscontrolmetodosystemmicrosoft