i want to pass parameter to linq query...

public IEnumerable GetPhotos()
{
    PhotoDBDataContext db = new PhotoDBDataContext();
    var tProduct = db.Photos;
    var query = from p in db.Photos
                orderby p.PhotoId descending
                select new { p.Album, p.AlbumId, p.Description, p.Photographer,
                             p.PhotographerId, p.PhotoId, p.Tags, p.Thumbnail,
                             p.Url };
    return query;
}

in above example "orderby p.PhotoId descending" is used, i want to use parameter in place of p.PhotoId

is it possible...