public sealed class VersionDescription 

{
  // Must be called within QueuedTask.Run
  Version CreateVersion(Geodatabase geodatabase, string versionName, string description, VersionAccessType versionAccessType)
  {
    if (!geodatabase.IsVersioningSupported()) return null;

    using (VersionManager versionManager = geodatabase.GetVersionManager())
    {
      VersionDescription versionDescription =
        new VersionDescription(versionName, description, versionAccessType);
      return versionManager.CreateVersion(versionDescription);
    }
  }
}