private string STEPText;

        public override void Run()
        {
            STEPText=String.Empty;
            var progrDialog = new ProgressDialog(bwRun);
            progrDialog.ShowDialog();

            var saveFileDialog = new SaveFileDialog { Filter = "STEP Файл| *.stp|Все файлы|*.*" };

            if (saveFileDialog.ShowDialog() == DialogResult.OK)
            {
                var file = new StreamWriter(saveFileDialog.FileName, false, Encoding.GetEncoding(1251));
                file.Write(STEPText);
                file.Close();
            }

        }

        private bool bwRun(BackgroundWorker bw)
        {

            var root = Context.ReferenceObject as NomenclatureObject;
            if (root == null) return false;

            var prod = new STEPLib.STEPFile(root.SystemFields.Id, root.Name, ClientView.Current.UserName, "Компания", "SYSTEM");
            prod.AddDoc(root.SystemFields.Id, root.Name, root.Denotation, 0, 0, 0, 1);
            var links = root.Children.RecursiveLoadHierarchy().Cast<NomenclatureHierarchyLink>();

            bw.ReportProgress(links.Count(),"set");
            int curent = 1;
            foreach (var link in links)
            {
               
                var childrenId = link.ChildObjectId;
                var name = link.ChildObject.Name;
                var denotation = ((NomenclatureObject)link.ChildObject).Denotation;
                var parentId = link.ParentObjectId;
                bw.ReportProgress(curent, string.Format("{0} [{1}]",name,denotation));
                if (!prod.ChToDup(childrenId)) prod.AddDoc(childrenId, name, denotation, parentId, -1, link.Amount.GetInt32());
                curent++;
            }

            STEPText = prod.GenStep();

            return true;
        }