c# - Two PPT Presentation is opening instead of one while running through VISUAL STUDIO 2010 -

i facing problem not able carve out solution. have written program in powerpoint presentation 2 slides developed using c#. when run program working fine blank powerpoint presentation created (presentation2.pptx). not able understand why blank presentation created. please me through this.

below code:

    private void thisaddin_startup(object sender, system.eventargs e)     {          dataset ds = new dataset();          sqlconnection con = new sqlconnection(@"data source=*****;initial catalog=******;user id=****;password=******");          sqlcommand sqlcomm = new sqlcommand("powerpointtest", con);          sqlcomm.commandtype = commandtype.storedprocedure;          sqldataadapter da = new sqldataadapter();          da.selectcommand = sqlcomm;          da.fill(ds);         powerpoint.application pptapplication = new powerpoint.application();          microsoft.office.interop.powerpoint.slides slides;         microsoft.office.interop.powerpoint._slide slide;         microsoft.office.interop.powerpoint._slide slide1;         microsoft.office.interop.powerpoint.textrange objtext;          // create presentation file         powerpoint.presentation pptpresentation = pptapplication.presentations.add(office.msotristate.msotrue);          microsoft.office.interop.powerpoint.customlayout customlayout = pptpresentation.slidemaster.customlayouts[microsoft.office.interop.powerpoint.ppslidelayout.pplayouttext];          // create new slide         slides = pptpresentation.slides;         slide = slides.addslide(1, customlayout);         slide1 = slides.addslide(2, customlayout);         slide.applytheme(@"c:\program files\microsoft office\document themes 14\austin.thmx");         slide1.applytheme(@"c:\program files\microsoft office\document themes 14\austin.thmx");         // add title         objtext = slide.shapes[1].textframe.textrange;         objtext.text = "test";         objtext.font.name = "arial";         objtext.font.size = 32;          objtext = slide1.shapes[1].textframe.textrange;         objtext.text = "test1";         objtext.font.name = "arial";         objtext.font.size = 40;          objtext = slide.shapes[2].textframe.textrange;         string username = convert.tostring(ds.tables[0].rows[0]["username"]);         string loginid = convert.tostring(ds.tables[0].rows[0]["loginid"]);         string emailid1 = convert.tostring(ds.tables[0].rows[0]["emailid1"]);         objtext.text = "username:" + username +"\n loginid:"+ loginid +"\n email id:"+emailid1+".";            objtext = slide1.shapes[2].textframe.textrange;         objtext.text = "content goes here\nyou cannot add text\nitem 3";         objtext.font.size = 24;           slide.notespage.shapes[2].textframe.textrange.text = "test";          pptpresentation.saveas(@"c:\temp\test.pptx", microsoft.office.interop.powerpoint.ppsaveasfiletype.ppsaveasdefault, office.msotristate.msotrue);      }      private void thisaddin_shutdown(object sender, system.eventargs e)     {     }      #region vsto generated code      /// <summary>     /// required method designer support - not modify     /// contents of method code editor.     /// </summary>     private void internalstartup()     {         this.startup += new system.eventhandler(thisaddin_startup);         this.shutdown += new system.eventhandler(thisaddin_shutdown);     }      #endregion } 

when create add-in project office applications, thisaddin class have field called application¹ running application object office application. should use interact running application rather having line:

powerpoint.application pptapplication = new powerpoint.application(); 

that is, should delete line , replace uses of pptapplication application.

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¹the field isn't visible in .cs file should able see in intellisense or expanding solution explorer: