System.Xml.XmlDocument.CreateNode C# (CSharp) Méthode

        public virtual XmlNode CreateNode(XmlNodeType type, string prefix, string name, string namespaceURI)
        {
            switch (type)
            {
                case XmlNodeType.Element:
                    if (prefix != null)
                        return CreateElement(prefix, name, namespaceURI);
                    else
                        return CreateElement(name, namespaceURI);

                case XmlNodeType.Attribute:
                    if (prefix != null)
                        return CreateAttribute(prefix, name, namespaceURI);
                    else
                        return CreateAttribute(name, namespaceURI);

                case XmlNodeType.Text:
                    return CreateTextNode(string.Empty);

                case XmlNodeType.CDATA:
                    return CreateCDataSection(string.Empty);

                case XmlNodeType.EntityReference:
                    return CreateEntityReference(name);

                case XmlNodeType.ProcessingInstruction:
                    return CreateProcessingInstruction(name, string.Empty);

                case XmlNodeType.XmlDeclaration:
                    return CreateXmlDeclaration("1.0", null, null);

                case XmlNodeType.Comment:
                    return CreateComment(string.Empty);

                case XmlNodeType.DocumentFragment:
                    return CreateDocumentFragment();

                case XmlNodeType.DocumentType:
                    return CreateDocumentType(name, string.Empty, string.Empty, string.Empty);

                case XmlNodeType.Document:
                    return new XmlDocument();

                case XmlNodeType.SignificantWhitespace:
                    return CreateSignificantWhitespace(string.Empty);

                case XmlNodeType.Whitespace:
                    return CreateWhitespace(string.Empty);

                default:
                    throw new ArgumentException(SR.Format(SR.Arg_CannotCreateNode, type));
            }
        }

 private void SaveAsXML()
 {
     DataTable dt = (DataTable)bindingSource.DataSource;
     XmlDocument doc = new XmlDocument();
     XmlNode rootNode = doc.CreateNode(XmlNodeType.Element,"root", null);
     foreach (DataRow row in dt.Rows)
     {
         object[] values = row.ItemArray;
         XmlNode prop = doc.CreateNode(XmlNodeType.Element, "propertyset", null);
         XmlNode name = doc.CreateNode(XmlNodeType.Element, "name", null);
         XmlNode value = doc.CreateNode(XmlNodeType.Element, "value", null);
         name.InnerText = (string)values[0];
         value.InnerText = (string)values[1];
         prop.AppendChild(name);
         prop.AppendChild(value);
         rootNode.AppendChild(prop);
     }
     doc.AppendChild(rootNode);
     string file = Path.Combine(GetExecutingDir(), xmlPropertyFileName);
     if (File.Exists(file))
     {
         File.Delete(file);
     }
     doc.Save(file);
     doc.RemoveAll();
     doc = null;
 }