Добавление данных в XML - C#

  <?xml version="1.0" encoding="utf-8" ?> 
- <UICustomizationSet xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <DefaultIcon>AvevaSharedIcons:ID_WARNING</DefaultIcon> 
- <UICustomizationFiles>
  <CustomizationFile Name="Module" Path="design.uic" /> 
  <CustomizationFile Name="SchematicExplorerAddin" Path="CoreSchematicMenu.uic" /> 
  <CustomizationFile Name="Project" Path="$1.uic" Optional="true" /> 
  <CustomizationFile Name="SVGCompare" Path="SVGCompare.uic" /> 
  <CustomizationFile Name="Cabling" Path="AVEVA.design.cabling.uic" /> 
  <CustomizationFile Name="Hvac" Path="AVEVA.design.hvac.uic" /> 
  <CustomizationFile Name="Supports" Path="AVEVA.design.MDS.uic" /> 
  <CustomizationFile Name="Piping" Path="AVEVA.design.piping.uic" /> 
  <CustomizationFile Name="Steelwork" Path="AVEVA.design.steelwork.uic" /> 
  <CustomizationFile Name="MessageAddin" Path="MessageWindowCoreMenus.uic" /> 
  <CustomizationFile Name="Laser" Path="AVEVA.design.laser.uic" /> 
  <CustomizationFile Name="Integrator" Path="Integrator.uic" /> 
  <CustomizationFile Name="DiagramViewer" Path="DiagramViewer.uic" /> 
  <CustomizationFile Name="InstrumentationImportAddin" Path="InstrumentationImportAddin.uic" /> 
  <CustomizationFile Name="CAD Cable SYSTEM" Path="CADCableSystems.uic" /> 
  <CustomizationFile Name="CAD Piping" Path="CADPiping.uic" /> 
  </UICustomizationFiles>
  </UICustomizationSet>

  <CustomizationFile Name="Test Zone" Path="TestZone.uic" />

 XmlDocument xmlDoc = new XmlDocument();
            xmlDoc.Load(customXMLFileName);
            var node = xmlDoc.DocumentElement.SelectSingleNode("/UICustomizationSet/UICustomizationFiles");

foreach (XmlNode item in node.ChildNodes)
            {
                MessageBox.Show(item.Attributes.GetNamedItem("Name").Value);
            }

       XmlElement elem = xmlDoc.CreateNode(  ( "CustomizationFile");
          elem.InnerText = "Name = "Test Zone" Path = "TestZone.uic"";

public bool FindCustomizationInfo(string Name)
        {
            bool result = false;
            string customXMLFileName = configData.AvevaPath + configData.E3DFolder + "" + configData.DesignCustomization;
            XmlDocument xmlDoc = new XmlDocument();
            xmlDoc.Load(customXMLFileName);
            var node = xmlDoc.DocumentElement.SelectSingleNode("/UICustomizationSet/UICustomizationFiles");
            foreach (XmlNode item in node.ChildNodes)
            {
              if (Name == item.Attributes.GetNamedItem("Name").Value) { result = true; break; }
            }
            return result;
        }

  public void AddCustomizationInfo(string Name, string Path)
            {
            string customXMLFileName = configData.AvevaPath + configData.E3DFolder + "" + configData.DesignCustomization;
            XmlDocument xmlDoc = new XmlDocument();
            xmlDoc.Load(customXMLFileName);
            var node = xmlDoc.DocumentElement.SelectSingleNode("/UICustomizationSet/UICustomizationFiles");
            XmlNode elem = xmlDoc.CreateElement("CustomizationFile");
            XmlAttribute xmlAttrName = xmlDoc.CreateAttribute("Name");
            xmlAttrName.Value = Name;
            elem.Attributes.Append(xmlAttrName);
            XmlAttribute xmlAttrPath = xmlDoc.CreateAttribute("Path");
            xmlAttrPath.Value = Path;
            elem.Attributes.Append(xmlAttrName);
            elem.Attributes.Append(xmlAttrPath);
            node.AppendChild(elem);
            xmlDoc.Save(customXMLFileName);
        }