asp.net mvc Invalid value for key 'attachdbfilename'

Question

I am currently reading Manning\'s \"ASP.NET MVC 4 in Action\" book and trying to get the first example to work.

Within my test application, I built a simple Model a

Answer 1

Though, I am bit late to respond to this question but I was facing the same issue and I resolved it by modifying the connection string like below

Hope this would be helpful for others too.