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

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

                object[] Properties = { basicData.DfaNumberN, basicData.DfaValueFn, basicData.ParamAlpha};
                string[] Names = { "DfaNumberN", "DfaValueFn", "ParamAlpha"};
                int licznik = 0;

                foreach (var property in Properties)
                {
                    List<Tuple<string, Vector<double>>> list = (List<Tuple<string, Vector<double>>>)property;
                    foreach (var tuple in list)
                    {
                        XmlElement moduleNode = file.CreateElement(string.Empty, Names[licznik], string.Empty);
                        module.AppendChild(moduleNode);

                        XmlElement lead = file.CreateElement(string.Empty, "lead", string.Empty);
                        XmlText leadValue = file.CreateTextNode(tuple.Item1);
                        lead.AppendChild(leadValue);
                        moduleNode.AppendChild(lead);

                        XmlElement samples = file.CreateElement(string.Empty, "samples", string.Empty);
                        string samplesText = null;
                        foreach (var value in tuple.Item2)
                        {
                            samplesText += value.ToString() + " ";
                        }

                        XmlText samplesValue = file.CreateTextNode(samplesText);
                        samples.AppendChild(samplesValue);
                        moduleNode.AppendChild(samples);
                    }

                    licznik++;
                }

                ew.InternalXMLFile = file;

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

            }
        }