c# - Background worker runs doWork multiple times -

private void button_uploadtopi_click(object sender, routedeventargs e)     {           this.newfilepath = this.textbox_input_filepath.text;         this.label_status.content = "";         if (bgworker.isbusy != true)         {               bgworker.runworkerasync();         }     } 

here click event.

public mainwindow()     {          initializecomponent();          this.progressbar.minimum = 0;         this.progressbar.maximum = 100;          this.bgworker = new backgroundworker();          this.bgworker.workerreportsprogress = true;         this.bgworker.workersupportscancellation = true;         reader.isopen = false;          this.bgworker.dowork += bgworker_dowork;         this.bgworker.progresschanged += bgworker_progresschanged;         this.bgworker.runworkercompleted += bgworker_runworkercompleted;     } 

main window method.

public partial class mainwindow : window {      private backgroundworker bgworker; 

bgworker initialized here.

void bgworker_runworkercompleted(object sender, runworkercompletedeventargs e)     {          this.progressbar.value = 0;         this.label_progresspercentage.content = "0%";         reporttextbox.scrolltoend();     } 

runworkcomplete code

the main issue is, if run application once, works expected. if click again, execute method twice, , if click again execute method 3 times. increment every new click.

can see main issue here?

a sample worked on against @galenus's suggestion. had same situation background worker, clicking work button firing dowork multiple times until initialized worker button. code block:

using system; using system.collections.generic; using system.linq; using system.text; using system.threading.tasks; using system.windows; using system.windows.controls; using system.windows.data; using system.windows.documents; using system.windows.input; using system.windows.media; using system.windows.media.imaging; using system.windows.navigation; using system.windows.shapes;  using system.componentmodel; using system.data;  namespace mouseclick {     /// <summary>     /// interaction logic mainwindow.xaml     /// </summary>     public partial class mainwindow : window     {            public mainwindow()         {             initializecomponent();         }          public backgroundworker worker = new backgroundworker();          private void button_click(object sender, routedeventargs e)         {             //e.handled = true; // din't              worker = new backgroundworker(); //stopped dowork being executed multiple times when button pressed again in same session             worker.workerreportsprogress = true;             worker.workersupportscancellation = true;             worker.dowork += worker_dowork;             worker.progresschanged += worker_progresschanged;             worker.runworkercompleted += worker_runworkercompleted;             worker.runworkerasync();          }          void worker_dowork(object sender, doworkeventargs e)         {               int tot = 1;              messagebox.show(tot.tostring()); //if message box appears multiple times, means dowork executing multiple times              datatable dt = new datatable();              dt.columns.add("running number");              (int = 0; <= 100; i++)             {                 if (worker.cancellationpending == true)                 {                     //http://stackoverflow.com/questions/8300799/cancel-background-worker-exception-in-e-result                     //  e.cancel = true; //this trick                     e.result = 100;                     return;                 }                 worker.reportprogress(i);                 system.threading.thread.sleep(1);                 dt.rows.add(i);             }             e.result = dt;         }          #region "worker_progresschanged"         void worker_progresschanged(object sender, progresschangedeventargs e)         {          }         #endregion          #region "worker_runworkercompleted"         void worker_runworkercompleted(object sender, runworkercompletedeventargs e)         {             mygrid.itemssource = ((datatable)e.result).defaultview;             worker.dispose();          }         #endregion      } }