WPF: Trying to add a class to Window.Resources Again -

i did same thing, still same error occurring: "the tag 'centertooltipconverter' not exist in xml namespace 'clr-namespace:wpfapplication1;assembly=wpfapplication1'. line 12 position 10."

centertooltipconverter.cs

namespace wpfapplication1 {     public class centertooltipconverter : imultivalueconverter     {         public object convert(object[] values, type targettype, object parameter, cultureinfo culture)         {             if (values.firstordefault(v => v == dependencyproperty.unsetvalue) != null)             {                 return double.nan;             }             double placementtargetwidth = (double)values[0];             double tooltipwidth = (double)values[1];             return (placementtargetwidth / 2.0) - (tooltipwidth / 2.0);         }          public object[] convertback(object value, type[] targettypes, object parameter, cultureinfo culture)         {             throw new notsupportedexception();         }     } } 

mainwindow.xaml

<window x:class="wpfapplication1.mainwindow"     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"     xmlns:local="clr-namespace:wpfapplication1;assembly=wpfapplication1"     title="mainwindow" height="350" width="525">      <window.resources>         <local:centertooltipconverter x:key="mycentertooltipconverter"/>     </window.resources> </window> 

what doing wrong? in advance!!!

remove assembly part if referring same assembly.

 xmlns:local="clr-namespace:wpfapplication1" 

or

 xmlns:custom="clr-namespace:wpfapplication1;assembly=" 

from msdn : assembly can omitted if clr-namespace referenced being defined within same assembly application code referencing custom classes. or, equivalent syntax case specify assembly=, no string token following equals sign.

i hope help.