Must be used to query the state of the control before closing the hosting form/page. If the result is FALSE, the control must not be destroyed as unsaved user input might get lost otherwise.
Platforms: Windows 10 (Version 21H2 - 23H2), Windows 11 (21H2 - 22H2), Windows Server 2016 - 2022
.NET: .NET Framework 4.8, .NET 6, .NET 8, .NET 9