c# - Forms created from async void Form.Load event handler of another Form -


i have async void event handler creates , form , passes sempahoreslim initial count 0 , waits asyncronously on (showing form before wait). when click button in form semaphore released , event handler continues execution on same context (uithread). debugging found when form shown , defwndproc called (called internally .net framework form class implementation) application freezes. why?

class debugform : form {     semaphoreslim waitok;     public debugform (semaphoreslim waitok)     {         initializecomponent();         this.waitok = waitok;     }       //added in initializecomponent     async void buttonok_click(object sender, eventargs e)     {         //do stuff ui         waitok.release();     } }

in mainform load event this:

async void mainform_load(object sender, eventargs e) {     semaphoreslim sem = new semaphoreslim(0);     form debugform = new debugform(sem);     //it stucks in show call low probability     debugform.show();     await sem.waitasync();     //do other stuff }


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