How To delete Collection From Context in Entity Framework 4.0

To Delete All Object by using Entity Framework 4.0

To Delete All OrderDetails of Customer Object where OrderID=103

 var x = customerContext.OrderDetails.Where(c => c.OrderID == 103);
 customerContext.DeleteAll(x.ToList());
 customerContext.SaveChanges();

you have to defile DeleteAll method in a static class

namespace Application.Global
{

public static class GlobalMethods

    {

      public static void DeleteAll(this ObjectContext context, IEnumerable records)

       {

           foreach (T record in records)

           {

               context.DeleteObject(record);

           }

       }

    }

}