c# - RoutedPropertyChangedEventArgs for WPF slider - "type or namespace could not be found" -

i'm following this example create simple slider value can use in windows store app.

however, when creating something_valuechanged (as per example) , try add routedpropertychangedeventargs of type double argument method, getting standard "the type or namespace name not found" error.

i've tried looking around @ other examples this seemed suggest missing 'using' imports such system.windows , system.windows.controls. however, getting latter missing (type or namespace...)!

here's relevant sections of code using in mainpage.xaml , mainpage.xaml.cs:

xaml:

<grid ...>     <grid ...>         ...         <slider  name="binsize" width="300" height="20"                      background="gray" maximum="100" minimum="0"                      canvas.left="50" canvas.top="50"                      valuechanged="binsize_valuechanged"/>     </grid> </grid> 

cs:

private void binsize_valuechanged(object sender,     routedpropertychangedeventargs<double> e) {     //nothing yet } 

could please tell me i'm doing wrong here?

if coding windows 8 app method signature/content should this:

    private void binsize_valuechanged(object sender, rangebasevaluechangedeventargs e)     {         string msg = string.format("current value: {0}", e.newvalue);         this.textblock1.text = msg;     } 

here msdn example toward bottom of page.

the tutorial following part work windows 8 app designed wpf (windows presentation foundation) application may vary slightly. whenever errors google name of item using , find windows 8 version.

i hope helps. best of luck.