XmlNodeList Nodes = xDoc.GetElementsByTagName("UserNode");
for (int i = 0; i < Nodes.Count; i++)
    {
        if (Nodes[i].Attributes["LoginID"] != null)
        {
            if (Nodes[i].Attributes["LoginID"].InnerText="2")//for example
            {
               Nodes[i].parentNode.RemoveChild(Nodes[i]);
                xDoc.Save(ccConfigPath);
            }
        }
    }