ASP.NET MVC add-migration. Project failed to build - asp.net-mvc

Question

I am trying to enable migrations for data entity: In Package Manager Console:
Enable-Migrations -ProjectName Vidly -ContextTypeName Vidly.Models.MyDBContext
I get:
Code First Migrations enabled for project Vidly.
Then
add-migration 'InitialModel'
I get: "The project 'Vidly' failed to build."
My Configuration.cs:
namespace Vidly.Migrations
{
using System;
using System.Data.Entity;
using System.Data.Entity.Migrations;
using System.Linq;
internal sealed class Configuration : DbMigrationsConfiguration<Vidly.Models.MyDBContext>
{
public Configuration()
{
AutomaticMigrationsEnabled = false;
}
protected override void Seed(Vidly.Models.MyDBContext context)
{
// This method will be called after migrating to the latest version.
// You can use the DbSet<T>.AddOrUpdate() helper extension method
// to avoid creating duplicate seed data.
}
}
}
And my MyDBContext.cs is
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Data.Entity;
namespace Vidly.Models
{
public class MyDBContext
{
public DbSet<Customer> Customers { get; set; } // My domain models
public DbSet<Movie> Movies { get; set; }// My domain models
}
}
The error message is:
error CS0311: The type 'Vidly.Models.MyDBContext' cannot be used as
type parameter 'TContext' in the generic type or method
'DbMigrationsConfiguration'. There is no implicit reference
conversion from 'Vidly.Models.MyDBContext' to
'System.Data.Entity.DbContext'.
It seems I cannot use MyDBContext as a type super class in Configuration.cs.
Please help. Thanks.

Answer 1

You are missing to implement DbContext.
Change AND try:
public class MyDBContext:DBContext
{
public MyDBContext() : base("ConnectionStringName")
{
}
public DbSet<Customer> Customers { get; set; } // My domain models
public DbSet<Movie> Movies { get; set; }// My domain models
}

Answer 2

Couple of things you are missing here.
Inheriting from DBContext
Constructor to pass the name of connection string entry you used in
use below snippet of code. note: replace VidlyDBConnectionString with your connection string name
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Data.Entity;
namespace Vidly.Models
{
public class MyDBContext :DbContext
{
public MyDBContext():base("name=VidlyDBConnectionString")
{
}
public DbSet<Customer> Customers { get; set; } // My domain models
public DbSet<Movie> Movies { get; set; }// My domain models
}
}

Answer 3

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Data.Entity;
namespace Vidly.Models;
{
public class MyDBContext :DbContext
{
public DbSet<Customer> Customers { get; set; } // My domain models
public DbSet<Movie> Movies { get; set; } // My domain models
}
}