using (IUnitOfWork unitOfWork = unitOfWorkFactory.Create())
{
    Client client = clientRepository.GetById(clientId);

    client.Lock();

    unitOfWork.Commit();
}

public interface IUnitOfWork : IDisposable
{
    void Save();
}

public class UnitOfWork : IUnitOfWork
{
    private readonly TransactionScope _transactionScope;
    private readonly ObjectContext _context;

    private bool needToAcceptChanges;

    protected UnitOfWork(ObjectContext context)
    {
        _context = context;
        _transactionScope = new TransactionScope();
    }

    public void Save()
    {
        _context.SaveChanges(SaveOptions.DetectChangesBeforeSave);
        _transactionScope.Complete();
        needToAcceptChanges = true;
    }

    public void Dispose()
    {
        if (needToAcceptChanges)
            _context.AcceptAllChanges();

        _context.Dispose();
        _transactionScope.Dispose();

        GC.SuppressFinalize(this);
    }
}

using (SqlTransaction transaction = connection.BeginTransaction("SampleTransaction"))
{
    // ...
    
    transaction.Commit();
}

using (IUnitOfWork unitOfWork = unitOfWorkFactory.Create())
{
    // ...

    unitOfWork.Commit();
}