c# - Strange: WinForms form closes automatically after button press -


my app winforms .net 4 (c#) , 1 of forms keeps on closing automatically after pressing button.

  • the form have default accept , cancel buttons these not touched.
  • there buttontestconnection_click event when clicked, job closes form somehow.
  • i using mouse click button not case of cascading keystrokes.
  • i not setting dialogresult in function.

i tried check stray this.close / this.dispose calls found none.

here code:

private void buttontestconnection_click (object sender, system.eventargs e) {     this.enabled = false;     this.cursor = system.windows.forms.cursors.waitcursor;      this.progressbar.minimum = 0;     this.progressbar.maximum = 500;     this.progressbar.value = 0;      this.progressbar.visible = true;     this.buttontestconnection.visible = false;      try     {         while (this.progressbar.value < this.progressbar.maximum)         {             // proxy code.             this.progressbar.value++;         }     }     catch     {     }      this.progressbar.visible = false;     this.buttontestconnection.visible = true;      this.progressbar.invalidate();     system.windows.forms.application.doevents();     system.threading.thread.sleep(10);      this.cursor = system.windows.forms.cursors.default;     this.enabled = true;      system.windows.forms.messagebox.show(result.tostring()); }

check if property dialogresult on button equals none.
if not, form closed when hit button , form return setting of button's dialogresult property.

usually, happens lot when copy/paste existing form's button forget remove on pasted button original dialogresult setting


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