VB.net stopping a backgroundworker -

i want create button stop background worker , end process working on.

here sample backgroundworker code:

       private sub button1_click(sender object, e eventargs) handles button1.click              try                 if backgroundworker1.isbusy <> true                     backgroundworker1.runworkerasync()                 end if             catch ex exception             end try          end sub          private sub backgroundworker1_dowork(sender system.object, e system.componentmodel.doworkeventargs) handles backgroundworker1.dowork              dim counter integer = 1                           'updated code stop function----------------             backgroundworker1.workersupportscancellation = true             if backgroundworker1.cancellationpending                 e.cancel = true                 progressbar1.value = 0                 exit             end if             'updated code stop function----------------              listbox1.items.add(counter)              progressbar1.value = ((counter - 1) / limit) * 100             counter = counter + 1             loop while(counter <= 999999999999999999)          end sub          private sub backgroundworker1_progresschanged(sender system.object, e system.componentmodel.progresschangedeventargs) handles backgroundworker1.progresschanged             try             catch ex exception             end try         end sub          private sub backgroundworker1_completed(sender system.object, e system.componentmodel.runworkercompletedeventargs) handles backgroundworker1.runworkercompleted             try             catch ex exception             end try         end sub          private sub form1_load(sender object, e eventargs) handles mybase.load             system.windows.forms.control.checkforillegalcrossthreadcalls = false             end sub          'updated code stop function----------------         private sub stopbutton_click(sender object, e eventargs) handles stopbutton.click               if backgroundworker1.isbusy                    if backgroundworker1.workersupportscancellation                                      backgroundworker1.cancelasync()                   end if               end if         end sub         'updated code stop function---------------- 

i want reset loop , return progress bar 0% when stop backgroundworker.

is possible?

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the code above has been updated , working fine.

i have added code inside loop:

        backgroundworker1.workersupportscancellation = true         if backgroundworker1.cancellationpending             e.cancel = true             progressbar1.value = 0             exit         end if 

i created button stops worker:

    private sub stopbutton_click(sender object, e eventargs) handles stopbutton.click           if backgroundworker1.isbusy                if backgroundworker1.workersupportscancellation                                  backgroundworker1.cancelasync()               end if           end if     end sub 

the backgroundworker class has method cancelasync() need call cancel execution of bgw.

you need set backgroundworker.workersupportscancellation property true , inside while loop need check cancellationpending property wether value true indicates call cancelasync() method.

if cancellationpending evaluates true, ( which should have done already ) call 1 of overloaded reportprogress() (docu) methods set progressbar value desired value.

edit: should set cancel property of doworkeventargs true can check cancelled property of runworkercompletedeventargs inside runworkercompletedevent.

you shouldn not access controls lives in ui thread. better use progresschanged(docu) event.

see: backgroundworker docu