ConfigurationManager class is used to load settings from an XML file at the start of an application. Usually people edit it outside the application (manually with a text editor), however, it is possible to change configuration inside the program:
http://blog.sb2.fr/post/2008/11/29/HowTo-Modify-Configuration-File-Programmatically-with-C.aspx
The Jabber-Net library uses this function to update its configuration file instead:
/// <summary>
/// Write the current connection properties to an XML config file.
/// TODO: Replace this with a better ConfigFile implementation that can write.
/// </summary>
/// <param name=”file”></param>
public void WriteToFile(string file)
{
XmlDocument doc = new XmlDocument();
string name = “JabberClient”;
if (m_xmpp != null)
name = m_xmpp.GetType().Name;
XmlElement root = (XmlElement)doc.CreateElement(name);
doc.AppendChild(root);
WriteElem(root, this);
foreach (DictionaryEntry ent in m_extra)
{
root.AppendChild(doc.CreateElement((string)ent.Key)).InnerText = ent.Value.ToString();
}
XmlTextWriter xw = new XmlTextWriter(file, System.Text.Encoding.UTF8);
xw.Formatting = Formatting.Indented;
doc.WriteContentTo(xw);
xw.Close();
}
More:
More advanced configuration library: http://www.codeproject.com/KB/cs/SysConfiguration.aspx