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If you do a search for Ora-06413, there are lots of potential causes and solutions, including some really odd things like running from a location with parenthesis in the path breaking it.
That said, the easiest way to fix any problem connecting with .net to Oracle 11 is to not use such an insanely out of date client version. Then you'd also be able to use the .net classes for connections instead of the obsolete msdaora provider (which is built on an Oracle 7 interface).
If you can't install another client for some reason due to fear about the old 8 client being messed up, try the managed provider beta. That doesn't require installation and plays nice with other clients.
Could be all kinds of things. I mentioned the paraenthis bug as one potential one. If your MVC app is running in 64 bit (the default on a 64 bit OS), there is no msdaora provider in 64 bit at all. Microsoft discontinued it. Doing a search for that error gives a huge list of potential reasons. At the end of the day it could just be something internal that MVC is trying to do that a driver that old doesn't properly support.