int callbackResult;
using (var trans = redis.CreateTransaction())
{
  trans.QueueCommand(r => r.Increment("key"));  
  trans.QueueCommand(r => r.Increment("key"), i => callbackResult = i);  
  trans.Commit();
}

public interface IRedisTransaction 
	: IDisposable
{
	void QueueCommand(Action<IRedisClient> command);
	void QueueCommand(Action<IRedisClient> command, Action onSuccessCallback);
	void QueueCommand(Action<IRedisClient> command, Action onSuccessCallback, Action<Exception> onErrorCallback);
	void QueueCommand(Func<IRedisClient, int> command);
	void QueueCommand(Func<IRedisClient, int> command, Action<int> onSuccessCallback);
	void QueueCommand(Func<IRedisClient, int> command, Action<int> onSuccessCallback, Action<Exception> onErrorCallback);
	void QueueCommand(Func<IRedisClient, bool> command);
	void QueueCommand(Func<IRedisClient, bool> command, Action<bool> onSuccessCallback);
	void QueueCommand(Func<IRedisClient, bool> command, Action<bool> onSuccessCallback, Action<Exception> onErrorCallback);
	void QueueCommand(Func<IRedisClient, double> command);
	void QueueCommand(Func<IRedisClient, double> command, Action<double> onSuccessCallback);
	void QueueCommand(Func<IRedisClient, double> command, Action<double> onSuccessCallback, Action<Exception> onErrorCallback);
	void QueueCommand(Func<IRedisClient, byte[]> command);
	void QueueCommand(Func<IRedisClient, byte[]> command, Action<byte[]> onSuccessCallback);
	void QueueCommand(Func<IRedisClient, byte[]> command, Action<byte[]> onSuccessCallback, Action<Exception> onErrorCallback);
	void QueueCommand(Func<IRedisClient, string> command);
	void QueueCommand(Func<IRedisClient, string> command, Action<string> onSuccessCallback);
	void QueueCommand(Func<IRedisClient, string> command, Action<string> onSuccessCallback, Action<Exception> onErrorCallback);
	void QueueCommand(Func<IRedisClient, List<string>> command);
	void QueueCommand(Func<IRedisClient, List<string>> command, Action<List<string>> onSuccessCallback);
	void QueueCommand(Func<IRedisClient, List<string>> command, Action<List<string>> onSuccessCallback, Action<Exception> onErrorCallback);
	void Commit();
	void Rollback();
}