GetAlternateSpellings.cs

IEnumerable<string> GetAlternateSpellings(string baseName)
{
  if (string.IsNullOrWhiteSpace(baseName))
    yield break;

  yield return baseName;
  if (baseName.Contains("_"))
  {
    yield return Regex.Replace(baseName, @"(_)([a-z])", m => m.Groups.Cast<Group>().Last().Value.ToUpper());
  }
  else if (char.IsLower(baseName[0]))
  {
    yield return Regex.Replace(baseName, @"([A-Z])", m => "_" + m.Value.ToLower());
  }
}