While working on a project I experienced the following error:

InvalidOperationException was unhandled by user code

An exception of type ‘System.InvalidOperationException’ occurred in EntityFramework.dll but was not handled in user code
Additional information: The model backing the ‘AdminDataContext’ context has changed since the database was created. Consider using Code First Migrations to update the database (http://go.microsoft.com/fwlink/?LinkId=238269).
First I double checked  if the context really changed by executing the Update-Database command in the “Package manager console”. But it told me that the database was up-to-date.
PM> Update-Database
Specify the ‘-Verbose’ flag to view the SQL statements being applied to the target database.
No pending explicit migrations.
Running Seed method.
After a couple of hours I found the solution. I needed to add a line of code to the Global.asax file:
namespace Juwelenkistje.Admin
    public class MvcApplication : System.Web.HttpApplication
        protected void Application_Start()
This method executes some code when the DbContext (between <>) is used to access the database. SeeMSDN for more information about how to implement this method.
Hope this helps to keep you productive.

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