Entity Framework - many to many update

// (1) Remove unused tags
var toRemove = dbAudio.AudioTags.Where(x => !audio.Tags.Contains(x.Tag.Name));
foreach (var srTag in toRemove)
{
    _dbContext.AudioTags.Remove(srTag);
}

// (2) Add new tags
var existingDbTagNames = dbAudio.AudioTags.Select(x => x.Tag.Name);
var newTagNames = audio.Tags.Except(existingDbTagNames);
foreach (var newTagName in newTagNames)
{
    var dbTag = _dbContext.Tags.FirstOrDefault(x => newTagName == x.Name);
    // What if the tag doesn't exist at all?
    if (dbTag == null)
        continue;

    dbAudio.AudioTags.Add(new AudioTag
    {
        Audio = dbAudio,
        Tag = dbTag
    });
}