system.web.helpers, and mnicrosoft.applicationblocks.data

hi.

There is an old vb web application that needs to be modified. It uses microsoft.applicationblocks.data.   It was developed about 10 years ago.  I'm having problems with the dlls.  After I added a reference to the applicationblocks.dll file I could compile, but couldnt run because I was missing verison 3.0 of system.web.helpers.  I installed verison 3.0 of system.web.helpers, but now it's telling me that it cannot 'load file or assembly 'system.web.mvc, version = 5.1.0.0, publickeytoken 31bf3856ad364e35 or one of it's dependencies.   I'm confused.

Isn't this dll only used for mvc projects? 

I am using visual studio 2012. Could this be part of my problem?

** I checked the project type Guid in the vbproj file and it tells me it's a mvc project version 5.0.  

thanks