C# WPF Indeterminate progress bar -

please suggest why following doesn't work? want display indeterminate progressbar starts when button clicked, after i've done work set indeterminate progressbar false stop it.

however when run code below indeterminate progressbar doesnt start. tried commenting out line this.progressbar.isindeterminate = false;, , when progressbar start doesn't terminate.

private void generatecsv_click(object sender, routedeventargs e) {     this.dispatcher.invoke(dispatcherpriority.normal, new action(delegate ()         {             this.progressbar.isindeterminate = true;              //do work             thread.sleep(10 * 1000);              this.progressbar.isindeterminate = false;         })); } 

your code can't work because "do work" happening on same thread on ui works. so, if thread busy "work", how can handle ui animation progressbar @ same time? have put "work" on thread, ui thread free , can job progressbar (or other ui controls).

1) create method work , returns task, can "awaited" completion:

private async task doworkasync() {     await task.run(() =>     {         //do work here         thread.sleep(2000);     }); } 

2) put async modifier on generatecsv_click:

private async void generatecsv_click(object sender, routedeventargs e) 

3) throw away "dispatcher" / "invoke" etc stuffs, , use doworkasync way:

private async void button_click(object sender, routedeventargs e) {     pb.isindeterminate = true;      await doworkasync();      pb.isindeterminate = false; } 

so, what's happening now? when generatecsv_click encounters first await... begins work automatically on thread, leaving ui thread free operate , animate progressbar. when work finished, control of method returns ui thread sets isindeterminate false.

here can find msdn tutorial on async programming: https://msdn.microsoft.com/en-us/library/mt674882.aspx if google "c# async await", you'll find dozens of tutorials, examples , explanations ;)