EKG_Project.IO.Heart_Class_Data_Worker.Save C# (CSharp) Method

        public void Save(ECG_Data data)
        {
            if (data is Heart_Class_Data)
            {
                Heart_Class_Data basicData = data as Heart_Class_Data;

                ECG_Worker ew = new ECG_Worker();
                XmlDocument file = new XmlDocument();
                string fileName = analysisName + "_Data.xml";
                file.Load(System.IO.Path.Combine(directory, fileName));
                XmlNode root = file.SelectSingleNode("EKG");

                XmlElement module = file.CreateElement(string.Empty, "module", string.Empty);
                string moduleName = this.GetType().Name;
                moduleName = moduleName.Replace("_Data_Worker", "");

                XmlNodeList existingModules = file.SelectNodes("EKG/module");
                foreach (XmlNode existingModule in existingModules)
                {
                    if (existingModule.Attributes["name"].Value == moduleName)
                    {
                        root.RemoveChild(existingModule);
                    }
                }

                module.SetAttribute("name", moduleName);
                root.AppendChild(module);

                List<Tuple<int, int>> list = basicData.ClassificationResult;
                foreach (var tuple in list)
                {
                    XmlElement moduleNode = file.CreateElement(string.Empty, "ClassificationResult", string.Empty);
                    module.AppendChild(moduleNode);

                    XmlElement item1 = file.CreateElement(string.Empty, "item1", string.Empty);
                    XmlText item1Value = file.CreateTextNode(tuple.Item1.ToString());
                    item1.AppendChild(item1Value);
                    moduleNode.AppendChild(item1);

                    XmlElement item2 = file.CreateElement(string.Empty, "item2", string.Empty);
                    XmlText item2Value = file.CreateTextNode(tuple.Item2.ToString());
                    item2.AppendChild(item2Value);
                    moduleNode.AppendChild(item2);
                }

                bool ChannelMliiDetected = basicData.ChannelMliiDetected;
                XmlElement channelMliiDetected = file.CreateElement(string.Empty, "ChannelMliiDetected", string.Empty);
                XmlText channelMliiDetectedValue = file.CreateTextNode(ChannelMliiDetected.ToString());
                channelMliiDetected.AppendChild(channelMliiDetectedValue);
                module.AppendChild(channelMliiDetected);

                ew.InternalXMLFile = file;

                file.Save(System.IO.Path.Combine(directory, fileName));

            }
        }