How to convert PowerPoint to HTML

How erp| conversions are used. NET to convert PowerPoint to HTML file
Of course we're going to use COM components, so we're going to install powerpoint2000, add a refrence to Vs.net and find Microsoft PowerPoint Object Library 9.0, add it in.
Then write the following code, very simple, I do not have to explain:
Using System;
Using Office;
Using PowerPoint;

Namespace Courseserver.course
{
<summary>
Author: Wang Hongsu
version:1.0
Date:2001/6/9
Description: Convert PowerPoint's PPT file to HTML file
</summary>
public class Convertpowerpoint
{
<summary>
Establish a reference to a powerpoint.application COM component
</summary>
Private powerpoint.application ppt;
<summary>
point to specific documents;
</summary>
Private Powerpoint.presentation Pptfile;
private string _htmlfilename;
<summary>
Write-only property to set the file path of the saved HTML file
</summary>
public string Htmlfilename
{
Set
{
_htmlfilename=value;
}
}

<summary>
Construction device
</summary>
Public Convertpowerpoint ()
{
//
Todo:add constructor Logic here
//

Ppt=new powerpoint.application ();
}
<summary>
Conversion process
</summary>
<param name= "Pptfilename" > PowerPoint file name to convert </param>

public void Convert (string pptfilename)
{

Pptfile=ppt. Presentations.Open (Pptfilename,office.msotristate.msotrue,office.msotristate.msoctrue, Office.MsoTriState.msoFalse);
Pptfile.saveas (_htmlfilename,powerpoint.ppsaveasfiletype.ppsaveashtml,office.msotristate.msoctrue);
Pptfile.close ();


}
}
}