using Microsoft.SqlServer.Management.SqlStudio.Explorer;

unable to find this pls assist
[update]
found the dll’s in this folders
C:\Program Files (x86)\Microsoft SQL Server\110\ (in the windows explorer just search for the missing reference and add the .dll)

[update]
Ok my bad i changed the target framework to .Net 4 client profile but have to change to .Net4 framework and the build suceeded
so was unable to resolve this what else i need to do?
This is the ultimate error haunting me

What you wrote is a namespace, not an assembly. You’re probably looking for the
Microsoft.SqlServer.Management.SDK.SqlStudioassembly.Note that not all assemblies are listed in this dialog. This can for instance be found in the (Program Files)
Microsoft SQL Server\100\Tools\Binn\VSShell\Common7\IDE\directory, you can use theBrowsefunctionality to add a reference.