ms entity framework delete child onject

Question

i have 2 tables without any cascade deletind. i wont to delete parent object with all child objects. i do like this

//get parent object
return _dataContext.Menu.Include("ChildMenu").Include("ParentMenu").Include("Pictures").FirstOrDefault(m => m.MenuId == id);
//then i loop all child objects
var picList = (List<Picture>)menu.Pictures.ToList();
            //foreach (var item in menu.Pictures)
            for (int i = 0; i < picList.Count; i++)
            {
                if (File.Exists(HttpContext.Current.Server.MapPath(picList[i].ImgPath)))
                {
                    File.Delete(HttpContext.Current.Server.MapPath(picList[i].ImgPath));
                }

                if (File.Exists(HttpContext.Current.Server.MapPath(picList[i].ThumbPath)))
                {
                    File.Delete(HttpContext.Current.Server.MapPath(picList[i].ThumbPath));
                }
//**what must i do here?**
//menu.Pictures.Remove(picList[i]);
//                DataManager dm = new DataManager();
//                dm.Picture.Delete(picList[i].Id);

                //menu.Pictures.de
                //_dataContext.SaveChanges();
                //picList[i] = null;

            }

//delete parent object
_dataContext.DeleteObject(_dataContext.Menu.Include("ChildMenu").Include("ParentMenu").Include("Pictures").FirstOrDefault(m => m.MenuId == id););
            _dataContext.SaveChanges();

Answer 1

It is enough to set the

<OnDelete Action="Cascade" />

for the master association end in the CSDL part of the model.
In this case your code will work.