static void MioMetodo(){
List = doc1.Descendants("Order")
                .Select(d => d.Value)
                .ToList();

for (int i = 0; i < List.Count; i++)
            {
                try
                {
                    var item = (from m in doc1.Elements("list").Elements("Order")
                                    where m.Value == List[i]
                                    select m);

                    item.Remove();

                    doc1.Save(path1);
                    var1 = doc1.Root.Descendants("Orde").Count();


                    //DoSomethingHeavy with List[i]

                    doc2.Element("list2").Add(new XElement("Order", List[i]));
                    doc2.Save(path2);

                        
                     var2= doc2.Root.Descendants("Order").Count();
                    
                }
                catch (Exception)
                {
        doc3.Element("list3").Add(new XElement("Order", List[i]));
                    doc3.Save(path3);

                    var3 = doc3.Root.Descendants("Order").Count();
                    
                }
}