This tip demonstrates how to create XML file using C#

StringWriter stringwriter = new StringWriter();
XmlTextWriter xmlTextWriter = new XmlTextWriter(stringwriter);
xmlTextWriter.Formatting = Formatting.Indented;
xmlTextWriter.WriteStartDocument();
xmlTextWriter.WriteStartElement("root");
xmlTextWriter.WriteStartElement("information");
xmlTextWriter.WriteElementString("FirstName", "First Name");
xmlTextWriter.WriteElementString("LastName", "Last Name");
xmlTextWriter.WriteEndElement();
xmlTextWriter.WriteEndDocument();
XmlDocument docSave = new XmlDocument();
docSave.LoadXml(stringwriter.ToString());
//write the path where you want to save the Xml file
docSave.Save(@"c:\Information.xml");

Output XML :

<?xml version="1.0" encoding="UTF-16"?>
<root>
   <information>
      <FirstName>First Name</FirstName>
      <LastName>Last Name</LastName>
   </information>
</root>