Read from Microsoft Word Document doc

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Runtime.InteropServices.ComTypes;

namespace Naresh

{

    class Program

    {

        static void Main(string[] args)

        {

            Microsoft.Office.Interop.Word.Application word = new Microsoft.Office.Interop.Word.Application();

            object miss = System.Reflection.Missing.Value;

            object path = @"C:\naresh\testing.docx";

            object readOnly = true;

            Microsoft.Office.Interop.Word.Document docs = word.Documents.Open(ref path, ref miss, ref readOnly, ref miss, ref miss, ref miss, ref miss, ref miss, ref miss, ref miss, ref miss, ref miss, ref miss, ref miss, ref miss, ref miss);

            string totaltext = "";

            for (int i = 0; i < docs.Paragraphs.Count; i++)

            {

                   totaltext += " \r\n "+ docs.Paragraphs[i+1].Range.Text.ToString();

            }

            Console.WriteLine(totaltext);

            docs.Close();

            word.Quit();

        }

    }

}

Read from Microsoft PowerPoint file ppt

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using Microsoft.Office.Core;

using PowerPoint = Microsoft.Office.Interop.PowerPoint;

namespace Naresh

{

    class Program

    {

        static void Main(string[] args)

        {

            Microsoft.Office.Interop.PowerPoint.Application PowerPoint_App = new Microsoft.Office.Interop.PowerPoint.Application();

            Microsoft.Office.Interop.PowerPoint.Presentations multi_presentations = PowerPoint_App.Presentations;

            Microsoft.Office.Interop.PowerPoint.Presentation presentation = multi_presentations.Open(@"C:\naresh\testing.pptx");

            string presentation_text = "";

            for (int i = 0; i < presentation.Slides.Count; i++)

            {

                foreach (var item in presentation.Slides[i+1].Shapes)

                {

                    var shape = (PowerPoint.Shape)item;

                    if (shape.HasTextFrame == MsoTriState.msoTrue)

                    {

                        if (shape.TextFrame.HasText == MsoTriState.msoTrue)

                        {

                            var textRange = shape.TextFrame.TextRange;

                            var text = textRange.Text;

                            presentation_text += text+" ";

                        }

                    }

                }

            }

            PowerPoint_App.Quit();

            Console.WriteLine(presentation_text);

        }

    }

}