Code first Approach to Entity Model

You should remember that you must download entity frame work from nuget pakasge manager

public class Student

    {

        [Key]

        public int StudentId { get; set; }

        public string Name { get; set; }

        public int standard { get; set; }

        public string CollegeName { get; set; }

        public string Address { get; set; }

    }

    public class StudentContext : DbContext

    {

        public DbSet<Student> Students { get; set; }

    }

web config

 <entityFramework>

    <providers>

      <provider invariantName="System.Data.SqlClient" type="System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer" />

    </providers>

    <defaultConnectionFactory type="System.Data.Entity.Infrastructure.LocalDbConnectionFactory, EntityFramework">

      <parameters>

        <parameter value="mssqllocaldb" />

      </parameters>

    </defaultConnectionFactory>

  </entityFramework>

  <connectionStrings>

    <add name="StudentContext" connectionString="Data Source=(LocalDB)\MSSQLLocalDB; Initial catalog=CodeFirstEFDB; Integrated Security=true;" providerName="System.Data.SqlClient" />

  </connectionStrings>

</configuration>