Binding an ObservableCollection.Count to Label with WPF -

i have simple label should include bound .count value of property of observablecollection.

the thing is, result 0 (zero). same property bound datagrid, works , updates if has changed in collection.

what doing wrong here?

here code:

<label contentstringformat="members: {0}">     <label.content>         <binding path="memberslist.count" mode="oneway" updatesourcetrigger="default" />     </label.content> </label> 

the property looks like:

public static observablecollection<mitglied> memberslist { get; set; } 

you can try this...

mainwindow.xaml.cs->

int counter = 0; private static observablecollection<string> _memberlist = new observablecollection<string>(); // suppose of string type..i took of string type check case public static observablecollection<string> memberlist {     { return mainwindow._memberlist; }     set { mainwindow._memberlist = value; } }  mainwindow() {     initializecomponent();     memberlist.add("0");     memberlist.add("1");     memberlist.add("2");     label1.datacontext = this; }  private void button_click(object sender, routedeventargs e) {               try     {         memberlist.removeat(counter);         counter++;      }      catch(exception ex)      {          string strtemp=ex.message();      }  } 

mainwindow.xaml->

    <grid>         <label name="label1" contentstringformat="members: {0}" margin="0,56,141,38" rendertransformorigin="0.158,1.154" horizontalalignment="right" width="183">         <label.content>             <binding path="memberlist.count" mode="oneway" updatesourcetrigger="default"/>         </label.content>     </label>         <button click="button_click" width="100" height="20" content="click" margin="43,169,360,122" />     </grid>