How to generate an XML file

I need to create an xml file here

bool result= false;

How to achieve this in ASP.NET with C# syntax. result is value that I need to add in the XML file.

I need to create an XML file under a folder with contents like this

<?xml version="1.0" encoding="utf-8" ?> 
<user>
  <Authenticated>yes</Authenticated> 
</user>

thank you

XElement xml = new XElement("user",
                    new XElement("Authenticated","Yes"))
                );
xml.Save(savePath);

It works for .net 3 and above, but You can use XmlDocument for later versions

    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("user");
    xmlDoc.InsertBefore(xmlDeclaration, xmlDoc.DocumentElement); 
    xmlDoc.AppendChild(rootNode);

    // Create the required nodes
    XmlElement mainNode  = xmlDoc.CreateElement("Authenticated");
    XmlText yesText= xmlDoc.CreateTextNode("Yes");
    mainNode.AppendChild(yesText);

    rootNode.AppendChild(mainNode);

    xmlDoc.Save(savePath);

You can use XmlWriter too as suggests @marc_s or at least you can store xml to the file like sting

using(StreamWriter sw = new StreamWriter(savePath))
{
sw.Write(string.Format("<?xml version=\"1.0\" encoding=\"utf-8\" ?>
<user><Authenticated>{0}</Authenticated></user>","Yes"));
}

How about this:

XmlTextWriter xtw = new XmlTextWriter(@"yourfilename.xml", Encoding.UTF8);

xtw.WriteProcessingInstruction("xml", "version=\"1.0\" encoding=\"utf-8\"");
xtw.WriteStartElement("user");
xtw.WriteStartElement("Authenticated");
xtw.WriteValue(result);
xtw.WriteEndElement();  // Authenticated
xtw.WriteEndElement();  // user

xtw.Flush();
xtw.Close();

Or if you prefer to build up your XML file in memory, you can also use the XmlDocument class and its methods:

// Create XmlDocument and add processing instruction
XmlDocument xdoc = new XmlDocument();
xdoc.AppendChild(xdoc.CreateProcessingInstruction("xml", "version=\"1.0\" encoding=\"utf-8\""));

// generate <user> element
XmlElement userElement = xdoc.CreateElement("user");

// create <Authenticated> subelement and set it's InnerText to the result value        
XmlElement authElement = xdoc.CreateElement("Authenticated");
authElement.InnerText = result.ToString();

// add the <Authenticated> node as a child to the <user> node
userElement.AppendChild(authElement);

// add the <user> node to the XmlDocument
xdoc.AppendChild(userElement);

// save to file
xdoc.Save(@"C:\yourtargetfile.xml");

Should work on any version of the .NET framework, if you have a using System.Xml; clause at the top of your file.

Marc

If you want to generate the XML and then give the user a choice to save the XML in their workstation, check the post below. It explains that process in detail.

Generating XML in Memory Stream and download