public enum RegistrationType : System.Enum, System.IComparable, System.IConvertible, System.IFormattable, System.ISpanFormattable  

{
  // Must be called within QueuedTask.Run
  bool IsTableVersioned(Geodatabase geodatabase, string tableName)
  {
    using (Table table = geodatabase.OpenDataset<Table>(tableName))
    {
      // Check table version type
      RegistrationType registrationType = table.GetRegistrationType();
      if (registrationType == RegistrationType.Versioned)
      {
        return true;
      }
    }
    return false;
  }
}