protected void ConvertToHtml(string docPath,string htmlPath)

{

Word.Application app=new Word.Application();

app.Visible=false;

Object o=Missing.Value;

object docFile=docPath;

_Document doc=app.Documents.Open(ref docFile,ref o,ref o,ref o,ref o,ref o,ref o,ref o,ref o,ref o,ref o,ref o,ref o,ref o,ref o);

object fileName=htmlPath;

object format=8;//Html

doc.SaveAs(ref fileName,ref format,ref o,ref o,ref o,ref o,ref o,ref o,ref o,ref o,ref o,ref o,ref o,ref o,ref o,ref o);

object t=true;

app.Quit(ref t,ref o,ref o);

}

我放了演示程序在上面的FTP里，关于C#和OFFICE操作的更多信息，等看一下微软的白皮书了

Whitepaper: Using Microsoft Office from C#

在www.gotdotnet.com上可以找到