Changes in Model .NET asp.net MVC4

Question

i've created a project using this steps

Create Model; Create Controller from Model and scaffolding Views;

I've tried to access, and it works fine, but I've made some changes in Model rebuilt and tried to run one more time, and now i got this error:

{"The model backing the 'CodingContext' context has changed since the database was created. Consider using Code First Migrations to update the database ( http://go.microsoft.com/fwlink/?LinkId=238269 )."}

This error brings a null inner exception

and this is the stack:

at System.Data.Entity.CreateDatabaseIfNotExists 1.InitializeDatabase(TContext context) at System.Data.Entity.Internal.InternalContext.<>c__DisplayClass8.<PerformDatabaseInitialization>b__6() at System.Data.Entity.Internal.InternalContext.PerformInitializationAction(Action action) at System.Data.Entity.Internal.InternalContext.PerformDatabaseInitialization() at System.Data.Entity.Internal.LazyInternalContext.<InitializeDatabase>b__4(InternalContext c) at System.Data.Entity.Internal.RetryAction 1.PerformAction(TInput input) at System.Data.Entity.Internal.LazyInternalContext.InitializeDatabaseAction(Action 1 action) at System.Data.Entity.Internal.LazyInternalContext.InitializeDatabase() 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.GetEnumerator() at System.Data.Entity.Infrastructure.DbQuery 1.GetEnumerator() at System.Data.Entity.Infrastructure.DbQuery 1.System.Collections.Generic.IEnumerable.GetEnumerator() at System.Collections.Generic.List 1..ctor(IEnumerable 1 collection) at System.Linq.Enumerable.ToList[TSource](IEnumerable 1 source) at Coding.Controllers.CorController.Index() in c:\\Users\\Guilherme\\Documents\\Visual Studio 2012\\Projects\\Coding\\Coding\\Controllers\\CorController.cs:line 19 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.Async.AsyncControllerActionInvoker.InvokeSynchronousActionMethod(ControllerContext controllerContext, ActionDescriptor actionDescriptor, IDictionary 2 parameters) at System.Web.Mvc.Async.As yncControllerActionInvoker.<>c_ DisplayClass42.b _41() at System.Web.Mvc.Async.AsyncResultWrapper.<>c_ DisplayClass8 1.<BeginSynchronous>b__7(IAsyncResult _) at System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncResult 1.End() at System.Web.Mvc.Async.AsyncResultWrapper.End[TResult](IAsyncResult asyncResult, Object tag) at System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeActionMethod(IAsyncResult asyncResult) at System.Web.Mvc.Async.AsyncControllerActionInvoker.<>c _DisplayClass37.<>c_ DisplayClass39.b _33() at System.Web.Mvc.Async.AsyncControllerActionInvoker.<>c_ DisplayClass4f.b _49()

I think the problem is about refresing the database using this new Model, but i can't found any command that solve this problem.

Thanks in advance!

Answer 1

If Someone got the same problem, I got this answer with some friend help, you must to follow these steps to update your database:

Open The package manager console: Tools –> Library Package Manager –> Package Manager Console

Install Entity Framework: Install-Package EntityFramework

Run: Enable-Migrations

At this point I'd got problems, but the Visual Studio show me the answer, is just a problem of multiple Contexts

Run: Add-Migration

Then: Update-Database

And it's done, every change in you model, require to run these commands!