While compiling my map application i'm always getting this error, i'm using visual studio 2008, i even incluse this namespace to my application,
using System.Collections.Specialized;
'System.Collections.Specialized.INotifyCollectionChanged' is defined in an assembly that is not referenced. You must add a reference to assembly 'WindowsBase, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35'.