System.InvalidOperationException was unhandled by user code The model backing the 'SomeContext' context has changed since the database was created

Problem:
Received the following exception when adding a field to an Entity class:

System.InvalidOperationException was unhandled by user code

  Message=The model backing the 'MovieDBContext' context has changed since the database was created. Either manually delete/update the database, or call Database.SetInitializer with an IDatabaseInitializer instance. For example, the DropCreateDatabaseIfModelChanges strategy will automatically delete and recreate the database, and optionally seed it with new data.

  Source=EntityFramework

Full Stack Trace at the end.

Code the exception occurred:

        MovieDBContext db = new MovieDBContext();

        public ActionResult Index()

        {

            var movies = from m in db.Movies

                         where m.ReleaseDate > new DateTime(1984, 6, 1)

                         select m;

            return View(movies.ToList());

        }

Solution:

Update the table in Sql Server to have the additional column you added to your entitiy class.

Full Stack Trace:

  StackTrace:

       at System.Data.Entity.Database.CreateDatabaseIfNotExists`1.InitializeDatabase(TContext context)

       at System.Data.Entity.Database.DbDatabase.<>c__DisplayClass8.b__5()

       at System.Data.Entity.Internal.InternalContext.PerformInitializationAction(Action action)

       at System.Data.Entity.Database.DbDatabase.Initialize(Boolean force)

       at System.Data.Entity.Internal.InternalContext.Initialize()

       at System.Data.Entity.Internal.InternalContext.GetEntitySetAndBaseTypeForType(Type entityType)

       at System.Data.Entity.Internal.Linq.InternalSet`1.Initialize()

       at System.Data.Entity.Internal.Linq.InternalSet`1.get_Provider()

       at System.Data.Entity.Infrastructure.DbQuery`1.System.Linq.IQueryable.get_Provider()

       at System.Linq.Queryable.Where[TSource](IQueryable`1 source, Expression`1 predicate)

       at MvcMovie.Controllers.MoviesController.Index() in xxxx\visual studio 2010\Projects\MovieApp\MvcMovie\Controllers\MoviesController.cs:line 16

       at lambda_method(Closure , ControllerBase , Object[] )

       at System.Web.Mvc.ActionMethodDispatcher.Execute(ControllerBase controller, Object[] parameters)

       at System.Web.Mvc.ReflectedActionDescriptor.Execute(ControllerContext controllerContext, IDictionary`2 parameters)

       at System.Web.Mvc.ControllerActionInvoker.InvokeActionMethod(ControllerContext controllerContext, ActionDescriptor actionDescriptor, IDictionary`2 parameters)

       at System.Web.Mvc.ControllerActionInvoker.<>c__DisplayClass15.b__12()

       at System.Web.Mvc.ControllerActionInvoker.InvokeActionMethodFilter(IActionFilter filter, ActionExecutingContext preContext, Func`1 continuation)