linq to sql批量删除

using (var context = new MyDataContext())
{
    var dataToDelete = context.MyTable.Where(x => x.DeleteFlag == true);
    foreach (var item in dataToDelete)
    {
        context.MyTable.DeleteOnSubmit(item);
    }
    context.SubmitChanges();
}

using (var context = new MyDataContext())
{
    var dataToDelete = context.MyTable.Where(x => x.DeleteFlag == true);
    context.MyTable.DeleteAllOnSubmit(dataToDelete);
    context.SubmitChanges();
}