https://learn.microsoft.com/en-us/dotnet/api/system.runtime.interopservices.safehandle.sethandleasinvalid?view=netframework-4.8.1&viewFallbackFrom=netcore-3.1
SafeHandle.SetHandleAsInvalid Method (System.Runtime.InteropServices) | Microsoft Learn
Marks a handle as no longer used.
methodsystemruntimemicrosoftlearn