Extract powerpoint titles with C# -

i have powerponint 97-2003 files(.ppt extension) , need extract slide titles programatically using c#. have tried using microsoft.office.interop without success. have search google , maximum have found how obtain reference powerpoint.slide:

using system; using system.collections.generic; using system.linq; using system.text; using microsoft.office.core; using powerpoint = microsoft.office.interop.powerpoint;  namespace tester {     class program     {         static void main(string[] args)         {             microsoft.office.interop.powerpoint.application presentationapp = new microsoft.office.interop.powerpoint.application();              try             {                 string pptpath = @"d:\somefile.ppt";                 testreadingtitles(presentationapp, pptpath);             }                         {                 presentationapp.quit();             }         }          private static void testreadingtitles(microsoft.office.interop.powerpoint.application presentationapp, string pptpath)         {             presentationapp.visible = microsoft.office.core.msotristate.msotrue;             microsoft.office.interop.powerpoint.presentations presentations = presentationapp.presentations;              microsoft.office.core.msotristate readonly = microsoft.office.core.msotristate.msotrue;             microsoft.office.core.msotristate untitled = microsoft.office.core.msotristate.msotrue;             microsoft.office.core.msotristate withwindow = microsoft.office.core.msotristate.msofalse;              microsoft.office.interop.powerpoint.presentation presentation = presentations.open(pptpath, readonly, untitled, withwindow);             (int = 0; < presentation.slides.count; i++)             {                 foreach (powerpoint.slide slide in presentation.slides)                 {                     string slidetitle = ??????????????????;                 }             }          }       } } 

you can extract titles without looping through shapes.

    private static string extractslidetitlefromslide(microsoft.office.interop.powerpoint.slide slide, string defaultvalue)     {         if (slide.shapes.hastitle == office.msotristate.msotrue)         {             if (slide.shapes.title.textframe.hastext == office.msotristate.msotrue)             {                 return slide.shapes.title.textframe.textrange.text;             }         }          return defaultvalue;     }