Accessing System.Collections.Specialized.NameValueCollection in Silverlight v3

Question

Hi,

I can see that the system reference is added in silverlight project in visual studio. The assembly is mapped to C:\Program Files\Reference Assemblies\Microsoft\Framework\Silverlight\v3.0\system.dll.

The namespace System.Collections.Specialized does not seem to have NameValueCollection class defined.

My issue is that i need to write an interface in the silvelight project and the return type of one of the method in interface is NameValueCollection. Please note that at this point its not feasible to change the return type to something else other than NameValueCollection.

Please let me know your views on this.