/// <summary>
/// Start Unit of Work specifying IPersistenceManager
/// </summary>
/// <param name="manager">IPersistenceManager</param>
/// <returns></returns>
public static IUnitOfWork Start(IPersistenceManager manager)
{
if (IsStarted)
throw new InvalidOperationException("Unit of Work is already started.");
IUnitOfWork unitOfWork = manager.CreateUnitOfWork();
LocalUnitOfWork = unitOfWork;
return unitOfWork;
}