C# Convert PPT files to PDF files

using System;
using ;
using ;
using ;
using ;
using ;
using ;
//Office namespacenamespace OfficeToPdf
{
  //Excel class  class PowerPointConverter
  {
    //Constructor    public PowerPointConverter()
    { }
    /// <summary>
    /// Convert PowerPoint to PDF    /// </summary>
    /// <param name="_lstrInputFile">origin file path</param>    /// <param name="_lstrOutFile">pdf file output path</param>    /// <returns>true Success</returns>    public bool ConverterToPdf(string _lstrInputFile, string _lstrOutFile)
    {
       lobjPowerPointApp = null;
       lobjppt = null;
      object lobjMissing = ;
      object lobjSaveChanges = null;
      try
      {
        lobjPowerPointApp = new ();
        lobjppt = (_lstrInputFile, , , );
        (_lstrOutFile, , );       
      }
      catch (Exception ex)
      {
        //Other log operations;        return false;
      }
      finally
      {
        if (lobjppt != null)
        {
          ();
          (lobjppt);
          lobjppt = null;
        }
        if (lobjPowerPointApp != null)
        {
          ();
          (lobjPowerPointApp);
          lobjPowerPointApp = null;
        }
        //Actively activate the garbage collector, mainly to avoid excessive memory usage when converting documents in large quantities, and the garbage collector is not running all the time!        ();
        ();
      }
      return true;
    }
  }
}