class MyUnitOfWork
{
    private readonly _tr;
    public MyUnitOfWork(IDbConnection c)
    {
        _tr = c.CreateTransaction();
        _tr.BeginTransaction();
    }

    public void SaveChanges()
    {
        _c.Commit();
    }
    public void Dispose()
    {
        if (!_c.Commited)
            _c.Rollback();
    }
}