$ ./hidedialog.exe
False
   at System.Environment.GetStackTrace(Exception e, Boolean needFileInfo)
   at System.Environment.get_StackTrace()
   at Test.OnClose(Object o, EventArgs args)
   at System.Windows.Forms.Form.OnClosed(EventArgs e)
   at System.Windows.Forms.Form.CheckCloseDialog(Boolean closingOnly)
   at System.Windows.Forms.Application.ThreadContext.System.Windows.Forms.Unsafe
NativeMethods.IMsoComponent.FContinueMessageLoop(Int32 reason, Int32 pvLoopData,
 MSG[] msgPeeked)
   at System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.Uns
afeNativeMethods.IMsoComponentManager.FPushMessageLoop(Int32 dwComponentID, Int3
2 reason, Int32 pvLoopData)
   at System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32 r
eason, ApplicationContext context)
   at System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32 reason
, ApplicationContext context)
   at System.Windows.Forms.Form.ShowDialog(IWin32Window owner)
   at System.Windows.Forms.Form.ShowDialog()
   at Test.Main()
OK