Updating user role using asp.net identity

Question

I have the following problem. While using the following code below to change the user\'s current role i am getting an exception with the message like below:

Answer 1

My roles are managed in the seed method of my DbMigrationsConfiguration class and I renamed it like this:

        if (context.Roles.Any(r => r.Name == "User"))
        {
            var store = new RoleStore(context);
            var manager = new RoleManager(store);
            var role = manager.Roles.First(r => r.Name == "User");

            role.Name = "NewNameForUser";
            manager.Update(role);
        }