c# - using a converter while reading xaml from string using XamlReader.Parse() -

i trying load xaml using xamlreader.parse() , code:

<helpers:filterdatagrid      xmlns:helpers="clr-namespace:urm.helpers;assembly=urm"     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"      xmlns:grid="clr-namespace:microsoft.windows.controls;assembly=wpftoolkit"     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"      xmlns:convert="clr-namespace:urm.converters;assembly=urm"     itemssource ="{binding pendingcontracts}"     autogeneratecolumns="false"      margin="20,0,10,0"     height ="auto"      width ="auto">      <helpers:filterdatagrid.resources>           <convert:dateconverter x:key="dateconverter"/>     </helpers:filterdatagrid.resources>      <helpers:filterdatagrid.columns>          <grid:datagridtextcolumn header="contract id" binding="{binding contractid}" />          <grid:datagridtextcolumn header="date submitted" binding="{binding datesubmitted, {staticresource dateconverter}}" />          <grid:datagridtextcolumn header="submitted by" binding="{binding submitted_by}" />          <grid:datagridtextcolumn header="company name" binding="{binding proprietors_company_name}" />          <grid:datagridtextcolumn header="term of contract" binding="{binding termofcontact}" />     </helpers:filterdatagrid.columns>  </helpers:filterdatagrid> 

how add converter. have added namespace converter keep getting error:

'cannot create unknown type '{clr-namespace:urm.converters;assembly=urm}dateconverter'.'

i added same manner added other namespaces work well.

edit: parse code

private void initialize()         {             using (var sp = new silentpartnerdatacontext())             {                 try {                     pendingcontracts = new observablecollection<salescontract>(getallcontracts());                     string data = sp.xamlexpressions.single(c => c.usercontrolname == "pendingcontracts").xamltext;                     contractcontent = xamlreader.parse(data) frameworkelement;                 }                 catch(exception)                 {                     messagebox.show("unable show data");                 }             }         } 

make sure dateconverter class public:

public class dateconverter : ivalueconverter {     ... }