How to get the title of a presentation of a powerpoint app C#

using System;
using System.Collections.Generic;
using Microsoft.Office.Core;
using PowerPoint = Microsoft.Office.Interop.PowerPoint;

namespace Mintra.Publisher.DocumentConverter.Core.Utils
{
    class InteropUtility
    {


        public static IList<string> GetPresentationTitles(string pptPath)
        {

            IList<string> result = new List<string>();

            var presentationApp = new Microsoft.Office.Interop.PowerPoint.Application();

            try
            {
                presentationApp.Visible = Microsoft.Office.Core.MsoTriState.msoTrue;
                Microsoft.Office.Interop.PowerPoint.Presentations presentations = presentationApp.Presentations;

                var readOnly = Microsoft.Office.Core.MsoTriState.msoTrue;
                var untitled = Microsoft.Office.Core.MsoTriState.msoTrue;
                var withWindow = Microsoft.Office.Core.MsoTriState.msoFalse;

                Microsoft.Office.Interop.PowerPoint.Presentation presentation = presentations.Open(pptPath, readOnly, untitled, withWindow);
                int i = 0;
                foreach (PowerPoint.Slide slide in presentation.Slides)
                {
                    string defaultTitle = String.Format("Slide {0}", i);
                    String shapeTitle = ExtractSlideTitlefromShape(slide, defaultTitle);
                    result.Add(shapeTitle);
                }
            }
            finally
            {
                presentationApp.Quit();
            }


            return result;

        }

        private static string ExtractSlideTitlefromShape(PowerPoint.Slide slide, string defaultValue)
        {
            PowerPoint.HeadersFooters headersFooters = slide.HeadersFooters;
            PowerPoint.Shapes mastershapes = slide.Master.Shapes;

            for (int i = 1; i <= slide.Shapes.Count; i++)
            {
                PowerPoint.Shape shape = slide.Shapes[i];
                bool hasTextFrame = shape.HasTextFrame == MsoTriState.msoTrue;
                bool isTypePlaceholder = shape.Type.Equals(MsoShapeType.msoPlaceholder);
                bool hasTextInTextFrame = shape.TextFrame.HasText == MsoTriState.msoTrue;
                bool isTitleShape = shape.Name.ToLower().Contains("title");

                if (isTypePlaceholder && hasTextFrame && hasTextInTextFrame && isTitleShape)
                {
                    return shape.TextFrame.TextRange.Text;

                }
            }

            return defaultValue;
        }

    }
}

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