无法识别ASP.NET Web应用程序名称空间

Question

I have created an ASP.NET Web Application, Web Form.

I have added EntityFramework 6.2

I have mapped the DB using Code First From Existing Database

Everything went fine, I have all the classes with the context like below:

namespace MyProject.DataModel
{
    using System;
    using System.Data.Entity;
    using System.ComponentModel.DataAnnotations.Schema;
    using System.Linq;

    public partial class MyDBEntities : DbContext
    {
        public MyDBEntities ()
            : base("name=MyDBEntities ")
        {
        }

        public virtual DbSet<Adm0> Adm0 { get; set; }
        public virtual DbSet<Adm1> Adm1 { get; set; }
        public virtual DbSet<Adm2> Adm2 { get; set; }
        public virtual DbSet<Country> Countries { get; set; }
        ...

The connection string is:

  <connectionStrings>
    <add name="MyDBEntities" connectionString="data source=10.11.xx.xx;initial catalog=xxxxxx;persist security info=True;user id=xxxx;password=xxxxxx;MultipleActiveResultSets=True;App=EntityFramework" providerName="System.Data.SqlClient" />
  </connectionStrings>

No error in the whole project, but if I try to access the DbContext there is no way! The namespace DataModel doesn't exist anywhere, is completely ignored:

Example:

Typing MyProject. Intellisense doesn't suggest DataModel

Typing MyProject.DataModel it gives error on DataModel saying that doesn't exist.

Why??

Answer 1

Have you more than a project in your solution? If so, you should add a reference between the project where you want to use your DbContext and the project that contains it.

From the official documentation:

To add a reference, right click on the References or Dependencies node in Solution Explorer and choose Add Reference Source

Also, make sure that the project that contains the DbContext is being compiled.