How to extract text from smartart with proper text indentation?

I have to convert smart-art to textual view same as "convert To Text" ribbon's work highlight in image (http://i.stack.imgur.com/1UdgY.png). Till now i am able to extract text from smart-art and write it to a shape. but i found below issues.

1. unable to make indentation of texts

2. After deleting the smart-art shape it add a blank shape to the slide.

below is the code what I have

private void ChangeSmartartToText(ref PresentationEXT textDeck, string deckType)
{
    PPT.Slide slide = textDeck.destinationPresentation.Slides[textDeck.currentSlideNumber+1];
    PPT.Shape tempSmartShape = null;

    foreach (Microsoft.Office.Interop.PowerPoint.Shape shape in slide.Shapes)
    {
        if (shape.HasSmartArt == MsoTriState.msoTrue)
        {
            tempSmartShape = shape;
            break;
        }
    }
    PPT.Shape newTextShape = null;
    if (tempSmartShape != null)
    {
        var smartartTop = tempSmartShape.Top;
        var smartartLeft = tempSmartShape.Left;
        var smartartHeight = tempSmartShape.Height;
        var smartartWidth = tempSmartShape.Width;

        newTextShape = slide.Shapes.AddShape(MsoAutoShapeType.msoShapeRectangle, smartartLeft, smartartTop, smartartWidth, smartartHeight);

        var val1 = tempSmartShape.SmartArt;
        string name = val1.Layout.Name;
        string category = val1.Layout.Category;
        StringBuilder smartartText = new StringBuilder();
        foreach (SmartArtNode node in val1.AllNodes)
        {
            smartartText.AppendLine(node.TextFrame2.TextRange.Text);
        }
        Microsoft.Office.Interop.PowerPoint.TextRange objText;
        objText = newTextShape.TextFrame.TextRange;
        newTextShape.TextFrame.Orientation = MsoTextOrientation.msoTextOrientationHorizontal;
        objText.Text = smartartText.ToString();

        tempSmartShape.Delete();
        tempSmartShape = null;
    }
}

from the above code I got the out put(shown in imagehttp://i.stack.imgur.com/ra1Hl.png) and also show what i need