static public class maperTest
    {
        public static ObjectModel MapObjectToObjectModel (this Object object){

             ObjectModel objectModel = new ObjectModel(){
                //parametri
             };

             return objectModel;
        }

        public static List<ObjectModel> MapObjectListToObjectModelList (this List<Object> object){

            List<ObjectModel> list = new List<ObjectModel>();

             foreach (var item in object)
            {
                list.Add(new ObjectModel(){
                    //parametri
                });
            }

             return list;
        }
    }