Error while reading indesign(.indd) file through COM object in c#

I want to read InDesign(.indd) file in c#. I have installed adobe InDesignCS6.

I have added COM reference of 'Adobe InDesign CS6 Type Library' in my c# application.

Code snippet is as follows.

        [STAThread]

        static void Main(string[] args)

        {

            InDesign.Application app = (InDesign.Application)COMCreateObject("InDesign.Application");

            Document doc = app.ActiveDocument;

            Page page = doc.Pages[1];

            TextFrame frame = page.TextFrames[1];

            Console.WriteLine(frame.Contents.ToString());

        }

        public static object COMCreateObject(string sProgID)

        {

            // We get the type using just the ProgID

            Type oType = Type.GetTypeFromProgID(sProgID);

            if (oType != null)

            {

                return Activator.CreateInstance(oType);

            }

            return null;

        }

But the first line itself throwing an following error while type casting output of COMCreateObject method into InDesign.Application type.

Error :

Unable to cast COM object of type 'System.__ComObject' to interface type 'InDesign.Application'. This operation failed because the QueryInterface call on the COM component for the interface with IID '{ABD4CBB2-0CFE-11D1-801D-0060B03C02E4}' failed due to the following error: No such interface supported (Exception from HRESULT: 0x80004002 (E_NOINTERFACE)).

Kindly help me. Its urgent.