Can the Sharepoint 2013 Client SDK be used in vs2010 C# ?

Hi All

I checked the 2 threads suggested after i typed the above but neither provides detail if this can be done and how, 

so i ask...

=> Can the Sharepoint 2013 Client SDK be used in vs2010 C# ? And How ?

I have manually added references to the Microsoft.SharePoint.Client and Microsoft.SharePoint.Client.Runtime dlls
but the compiler and Intellisense does not like the 

using Microsoft.SharePoint.Client;   

statement.

Thanks!!