public string GetNetworkGraph(string serverId, string portId, DateTime? startDate = null, DateTime? endDate = null, string mode = null) { string startDate_unixtime = (startDate == null) ? string.Empty : toUnixTime((DateTime)startDate); string endDate_unixtime = (endDate == null) ? string.Empty : toUnixTime((DateTime)endDate); return ServersProvider.GetNetworkGraph(serverId, portId, startDate_unixtime, endDate_unixtime, mode, this.DefaultRegion, this.Identity); }