Как rtf разбить по абзацам в массив или коллекцию

object oEndOfDoc = "\\endofdoc"; /* \endofdoc is a predefined bookmark */
 
      //Start Word and create a new document.
      Word._Application wordApp = new Word.Application();
      wordApp.Visible = true;
      Word._Document wordDoc = wordApp.Documents.Add();
 
      object oClassType = "MSGraph.Chart.8";
      wordRange = wordDoc.Bookmarks.get_Item(ref oEndOfDoc).Range;
 
      Word.InlineShape oShape = wordRange.InlineShapes.AddOLEObject(ref oClassType);
      Graph.Chart graphChart = oShape.OLEFormat.Object as Graph.Chart;
      graphChart.ChartType = Graph.XlChartType.xl3DBarClustered;
      graphChart.Left = 100;
      graphChart.Top = 100;
      graphChart.Width = 700;
      graphChart.Height = 700;
      graphChart.ChartArea.Font.Size = 8;
      graphChart.HasTitle = true;
      graphChart.ChartTitle.Text = "Sales Per Product";
      graphChart.ChartTitle.Font.Size = 12;
      Graph.Axis axis = graphChart.Axes(Graph.XlAxisType.xlValue) as Graph.Axis;
      axis.HasTitle = true;
      axis.AxisTitle.Caption = "Dollars ($)";
 
      graphChart.Application.DataSheet.Cells.Clear();
 
      graphChart.Application.DataSheet.Cells[2, 1] = "Widgets";
      graphChart.Application.DataSheet.Cells[3, 1] = "Gadgets";
      graphChart.Application.DataSheet.Cells[4, 1] = "Gizmos";
 
      graphChart.Application.DataSheet.Cells[1, 2] = "1999";
      graphChart.Application.DataSheet.Cells[1, 3] = "2000";
      Random random = new Random();
      int iSales = 0;
 
      for (int i = 2; i < 5; i++)
      {
        for (int j = 2; j < 4; j++)
        {
          iSales = random.Next(100000);
          graphChart.Application.DataSheet.Cells[i, j] = iSales.ToString();
        }
      }
 
      graphChart.Application.Update();
      graphChart.Application.Quit();

            RichTextBox rtb = new RichTextBox();
            rtb.LoadFile(@"имя_файла.rtf");
            string[] s = rtb.Text.Split('\u000A');