Winforms issue - Error creating window handle [duplicate]

Answer 1

I added a check that makes it work...

if (_form.Handle.ToInt32() > 0)
{
   _form.Invoke(method, args);
}

it is always true, but the form throws an error without it. BTW, my handle is around 4.9 million

Answer 2

I think it's normally related to the computer running out of memory so it's not able to create any more window handles. Normally windows starts to show some strange behavior at this point as well.

Answer 3

This problem is almost always related to the GDI Object count, User Object count or Handle count and usually not because of an out-of-memory condition on your machine.

When I am tracking one of these bugs, I open ProcessExplorer and watch these columns: Handles, Threads, GDI Objects, USER Objects, Private Bytes, Virtual Size and Working Set.

(In my experience, the problem is usually an object leak due to an event handler holding the object and preventing it from being disposed.)

Answer 4

Definitely too many handles(memory leak issue):

IT Jungles: System.ComponentModel.Win32Exception: Error creating window handle