The type or namespace name 'Microsoft.SqlServer.DacServices' could not be found (are you missing a using directive or an assembly reference

Microsoft.SqlServer.DacServices dll is referenced in a unit test project and the compiler is showing an error - The type or namespace name 'DacServices' could not be found. 

Although I referenced the dll file in the project visual studio is still errors out as a missing library. I have also tried downloading the file which has the library from http://www.microsoft.com/en-us/download/details.aspx?id=40735

by installing Microsoft Data-Tier Application Framework for SQl Server.

Please shade light on this.

Thanks,

Manny