FunctionForm.Operation.frmCreateDocument.cmdPreview_Click C# (CSharp) Method

        private void cmdPreview_Click(object sender, EventArgs e)
        {
            try
            {
                BsonDocument newdoc = BsonDocument.Parse(txtDocument.Text);
                UiHelper.FillDataToTreeView("InsertDocument", trvNewDocument, newdoc);
                trvNewDocument.TreeView.ExpandAll();
                txtDocument.Text = newdoc.ToJson(MongoHelper.JsonWriterSettings);
            }
            catch (Exception ex)
            {
                Utility.ExceptionDeal(ex);
            }
        }