We need to use wms service to display the data in the map. I referred the websites given below.
https://community.esri.com/thread/69289
http://resources.arcgis.com/en/help/runtime-wpf/concepts/index.html#//017000000084000000
When I try to add
<SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: 13px;">ESRI.ArcGIS.Client.Toolkit.DataSources.WmsLayer newLayer = new ESRI.ArcGIS.Client.Toolkit.DataSources.WmsLayer(); </SPAN>
in the code, it says Datasources does not exist in the namespace ESRI.ArcGIS.Client.Toolkit.
I want to know the problem with 'ESRI.ArcGIS.Client.Toolkit' installed in the application.