.net - Unknown Windows Message 0xC052 -

i'm working on problem (how detect form open inside application) , stumbled on windows message can't understand: 0xc052.

this first message receive in messagefilter when form opens. since didn't found reference don't want rely on assumption, message tells me reliable form opened.

edit: added code

application.addmessagefilter(new messagefilterimpl());  class messagefilterimpl : imessagefilter {     public bool prefiltermessage(ref message m)     {         control wnd = form.fromhandle(m.hwnd);         if (wnd form)             knownforms.add((form)wnd); //m.msg 0xc052          return false;     } } 

assuming well-formed windows message, it's dynamically allocated id returned registerwindowmessage function (note range 0xc000-0xffff). function used when need define new windows message that's supposed system-unique. in other words, you can't rely on id - different next time reboot.

.net winforms uses internally plenty of times - it's behaving windows application framework. exact number found might conceivably correspond like:

• a thread callback (invoke , friends)
• mouse enter message
• get control name (name)

and of course, doesn't have .net message - there might application on system broadcasts messages forms, example. it's common way of handling rpc (in case, form received e.g. msuim.msg.rpcsendreceive).