XDocument machineConfig = XDocument.Load(string.Format(@"{0}\config\machine.config", dotnet));
     Dictionary<string, string> sectionAttributes = new Dictionary<string, string>();
     sectionAttributes["name"] = "system.webServer";
     sectionAttributes["type"] = "System.Configuration.IgnoreSectionHandler, System, Version=1.0.5000.0, Culture=neutral, PublicKeyToken= PublicKeyToken=b77a5c561934e089";
     if (!machineConfig.Descendants(XName.Get("section"))
         .Any((XElement element) =>
           {
             return sectionAttributes.Keys.All((string key) =>
                 element.Attribute(XName.Get(key)).Value == sectionAttributes[key]);
             //List<string> keys = sectionAttributes.Keys.ToList<string>();
             //return element.Attributes().Aggregate<XAttribute, int>(0, (int count, XAttribute attrib) =>
             // {
             //    if (keys.Contains(attrib.Name.NamespaceName) && attrib.Value == sectionAttributes[attrib.Name.NamespaceName])
             //    {
             //      ++count;
             //      keys.Remove(attrib.Name.NamespaceName);
             //    }
             //    return count;
             // }) == keys.Count;
           }));
     {
       XElement configSections = machineConfig.Descendants(XName.Get("configSections")).First();
       //<section name="system.webServer" type="System.Configuration.IgnoreSectionHandler,
       //System, Version=1.0.5000.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" />
       XElement section = new XElement(XName.Get("section"),
                             new XAttribute(XName.Get("name"), sectionAttributes["name"]),
                             new XAttribute(XName.Get("type"), sectionAttributes["type"]));
       configSections.Add(section);
     }

   }