async Task IBotDataStore <BotData> .SaveAsync(IAddress key, BotStoreType botStoreType, BotData botData, CancellationToken cancellationToken)
        {
            SqlBotDataEntity entity = new SqlBotDataEntity(botStoreType, key.BotId, key.ChannelId, key.ConversationId, key.UserId, botData.Data)
            {
                ETag       = botData.ETag,
                ServiceUrl = key.ServiceUrl
            };

            using (var context = new SqlBotDataContext(_connectionString))
            {
                try
                {
                    if (string.IsNullOrEmpty(botData.ETag))
                    {
                        context.BotData.Add(entity);
                    }
                    else if (entity.ETag == "*")
                    {
                        var foundData = await SqlBotDataEntity.GetSqlBotDataEntity(key, botStoreType, context);

                        if (botData.Data != null)
                        {
                            if (foundData == null)
                            {
                                context.BotData.Add(entity);
                            }
                            else
                            {
                                foundData.Data       = entity.Data;
                                foundData.ServiceUrl = entity.ServiceUrl;
                            }
                        }
                        else
                        {
                            if (foundData != null)
                            {
                                context.BotData.Remove(foundData);
                            }
                        }
                    }
                    else
                    {
                        var foundData = await SqlBotDataEntity.GetSqlBotDataEntity(key, botStoreType, context);

                        if (botData.Data != null)
                        {
                            if (foundData == null)
                            {
                                context.BotData.Add(entity);
                            }
                            else
                            {
                                foundData.Data       = entity.Data;
                                foundData.ServiceUrl = entity.ServiceUrl;
                                foundData.ETag       = entity.ETag;
                            }
                        }
                        else
                        {
                            if (foundData != null)
                            {
                                context.BotData.Remove(foundData);
                            }
                        }
                    }
                    await context.SaveChangesAsync();
                }
                catch (System.Data.SqlClient.SqlException err)
                {
                    throw new HttpException((int)HttpStatusCode.InternalServerError, err.Message);
                }
            }
        }