title: DeleteOnSubmit not showing up on LinqToSql
body: <p>I've read all posts that I could find related to this subject and applied their solutions, but still the DeleteOnSubmit() method does not show as an option. 
  DeleteObject() doesn't either.
  Using EF 6.1.3, NET 4.5 and VS 2013. I've also added a reference to  System.Data.Link. Here is part of the code, simplified for clarity:</p>
  
  <pre><code>using System;
  using System.Collections.Generic;
  using System.Linq;
  using System.Web;
  using System.Data.Entity;
  using System.Data.Entity.Infrastructure;
  using System.Data.Linq;
  
     public void DeleteRow(int rowId)
      {
                using (AppDataDbContext db = new AppDataDbContext())
                  {
  
                      db.Reservations.?????
  
  
  
  using System;
  using System.Collections.Generic;
  using System.Linq;
  using System.Web;
  using System.Data.Entity;
  
      public class AppDataDbContext: DbContext
      {
                 public AppDataDbContext()
              : base("name=DefaultConnection")
          {
          }
  
          public DbSet&lt;Reservation&gt; Reservations { get; set; }
      }
  enter code here
  
  
  public class Reservation
  {
      [Key()]
      [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
      public int IdNo { get; set; }
      public int ClientAcctNo { get; set; }
      public string Description { get; set; }
      public DateTime DueDate { get; set; }
      public string Status { get; set; }
  }
  </code></pre>