c# - How to use Progressbar in MVVM -

i'm stuck on this. searched lot in net nothing helped me. in view have 1 button , progressbar, when user click on button different work , after increase currentprogress.

but shows user in end of work 100% in end , not want. eachtime currentprogress increased shows , display view.

the controls in view those:

<button x:name="generate" content="generate" /> <progressbar  value="{binding path=currentprogress, mode=oneway}" width="80" height="15"/> 

and code in viewmodel

private int currentprogress; public int currentprogress {     { return currentprogress; }     set     {         if (currentprogress == value)                    return;          currentprogress = value;         notifyofpropertychange(() => currentprogress);     } }  list<article> articles;   public void generate() {     foreach (var art in articles)     {                //[..]         //insert article                              inserted++;          task.factory.startnew(() =>updateprogress(inserted));                         }  }   private void updateprogress(int analyzed) {     if (analyzed != 0)     {         int percentage = 100 * analyzed / articles.count;         currentprogress = percentage;     }    } 

how fix issue?. in advance!

put whole content of "generate" method inside task. don't need special update progress since "notifypropertychanged" events automatically marshalled @ ui level wpf. this:

task.factory.startnew(() => {     foreach (var art in articles)     {                //[..]         //insert article                              inserted++;          updateprogress(inserted);                         } }