查询所有的linq对象怎么写？？？

C# code

 CPJCDataDataContext cc = new CPJCDataDataContext(); LinkButton lbn = (LinkButton)sender;        int index = ((GridViewRow)lbn.NamingContainer).RowIndex;        int id = Convert.ToInt16(GridView1.DataKeys[index].Value);  City city = cc.City.Where(p => p.Parent_ID == id).FirstOrDefault();  cc.City.DeleteOnSubmit(city);        cc.SubmitChanges();//因为parent_id有很多个，如果我这样写的话，只能删除一个，请问，我该怎么写？？？

[解决办法]
var citys = cc.City.Where(p => p.Parent_ID == id);
cc.City.DeleteAllOnSubmit(citys);
cc.SubmitChanges();