Transaction Business service able to handle nested transactions

TransactionService.cs

public class TransactionService : ITransactionService
    {
        private IDbContextTransaction _transaction;
        private readonly IUnitOfWork _unitOfWork;
        private Queue _transactions;

        public TransactionService(IUnitOfWork unitOfWork)
        {
            _unitOfWork = unitOfWork;
            _transactions = new Queue();
        }

        public void BeginTransaction()
        {
            _transactions.Enqueue(1);

            if(_unitOfWork.Context.Database.CurrentTransaction == null)
                _transaction = _unitOfWork.Context.Database.BeginTransaction();
        }

        public void Commit()
        {     
            if(_transactions.Count > 0)
                _transactions.Dequeue();
            
            if(_transactions.Count == 0)
                _transaction.Commit();
        }

        public void Rollback()
        {
            _transaction.Rollback();
        }
    }