How to create xml file at runtime on client system temprary

public void Xml_Insert()
   {

           XmlDocument xmlDoc = new XmlDocument();

           // Write down the XML declaration
           XmlDeclaration xmlDeclaration = xmlDoc.CreateXmlDeclaration("1.0", "utf-8", null);

           // Create the root element
           XmlElement rootNode = xmlDoc.CreateElement("CategoryList");
           xmlDoc.InsertBefore(xmlDeclaration, xmlDoc.DocumentElement);
           xmlDoc.AppendChild(rootNode);

           // Create a new <Category> element and add it to the root node
           XmlElement parentNode = xmlDoc.CreateElement("Category");

           // Set attribute name and value!
           parentNode.SetAttribute("ID", "01");

           xmlDoc.DocumentElement.PrependChild(parentNode);

           // Create the required nodes
           XmlElement mainNode = xmlDoc.CreateElement("MainCategory");
           XmlElement descNode = xmlDoc.CreateElement("Description");
           XmlElement activeNode = xmlDoc.CreateElement("Active");

           // retrieve the text
           XmlText categoryText = xmlDoc.CreateTextNode("XML");
           XmlText descText = xmlDoc.CreateTextNode("This is a list my XML articles.");
           XmlText activeText = xmlDoc.CreateTextNode("true");

           // append the nodes to the parentNode without the value
           parentNode.AppendChild(mainNode);
           parentNode.AppendChild(descNode);
           parentNode.AppendChild(activeNode);

           // save the value of the fields into the nodes
           mainNode.AppendChild(categoryText);
           descNode.AppendChild(descText);
           activeNode.AppendChild(activeText);

           // Save to the XML file
           xmlDoc.Save(Server.MapPath("categories.xml"));

           Response.Write("XML file created");

   }