Detecting Web.Config Authentication Mode

Question

Say I have the following web.config:

Answer 1

use an xpath query //configuration/system.web/authentication[mode] ?

protected void Page_Load(object sender, EventArgs e)
{
 XmlDocument config = new XmlDocument();
 config.Load(AppDomain.CurrentDomain.SetupInformation.ConfigurationFile);
 XmlNode node = config.SelectSingleNode("//configuration/system.web/authentication");
 this.Label1.Text = node.Attributes["mode"].Value;
}