Transactions in the Repository Pattern using ServiceStack.ORMLite

I'm implementing Repository Pattern using ServiceStack.ORMLite like this:

public class MyRepository : IMyRepository
{
    private IDbConnectionFactory DbConnectionFactory = null;

    public MyRepository(IDbConnectionFactory dbConnectionFactory)
    {
        DbConnectionFactory = dbConnectionFactory;
    }

    public void MyMethod()
    {
        using (var connection = DbConnectionFactory.OpenDbConnection())
        using (var cmd = connection.CreateCommand())
        {
            //Do something here
        }
    }
}

But I don't know how to handle DbTransaction when I need to warp some DB operation in a DbTransaction.It looks like TransactionScope is a solution but I don't know whether is way too heavy for this.