c# - Winform freezes when I try to close it -

i have following code

private void btnclose_click(object sender, system.eventargs e) {      close(); } // btnclose_click 

after running close winforms function application freezes. idea why can happen?

i use .net 2.0 , run under windows 7 vs2005

edit:

after pressed pause in debugger came

private void mainform_closing(object sender, system.componentmodel.canceleventargs e) {   // gui   if (fscannerthread_running)   {     fscannerthread_running = false;     fscannerthread.join();   } } 

and stacked in fscannerthread.join(); idea how can kill ?

use bool thread.join(int milliseconds) overload, , if result false, abort() thread.

private void mainform_closing(object sender, system.componentmodel.canceleventargs e) {     // gui     if (fscannerthread_running)     {         fscannerthread_running = false;         if (!fscannerthread.join(1000)) // give thread 1 sec stop         {             fscanner.abort();         }         } } 

note should catch threadabortexception in thread in order end gracefully (if have release instance).