Visio - new DrawingControlC lass() thowing exception - 'class not registered'

[gkelly]

I looked a looked for an answer to this question and I have not been
able to find anything.
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using MSVisio = Microsoft.Offic e.Interop.Visio ;
using MSVisOcx = Microsoft.Offic e.Interop.VisOc x;

MSVisOcx.Drawin gControl v_dc = new MSVisOcx.Drawin gControlClass() ;
MSVisio.Applica tion v_app = v_dc.Document.A pplication;
MSVisio.Documen t v_doc = v_app.Documents .OpenEx( @"c:\TestVisio. vsd",
0 );
MSVisio.Page v_page = v_doc.Pages[1];
v_page.Export( @"c:\TestVisio. jpg" );
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This code works fine in a regular windows app, it opens a visio
drawing and then exports the drawing to a jpg file. And it does't use
automation.

However, when I use this same code in a web app, it throws an
exception on the line 'new DrawingControlC lass' saying class not
registered.

Like i've said, I've looked and looked and can't seem to find any info
to solve this problem. Do you have any idea why this is happening?
Or, can you point me to a working example that I can follow.

thank you,

gkelly