Will redesign in ASP affect SEO?

[DuglasM4]

Hi,

Does anybody know if redesigning a site would affect search engine placement. We

have a potential customer who currently has a very high web presence and doesn’t

want this to be affected by a new site. He currently has html pages, so I imagine

redesigning these, naming them the same and uploading them to the same place

would made absolutely no difference – but, would there be a difference if the

site is moved to another host and also if the pages are changed to be asp or the

whole thing is database driven?

Thanks if anyone can help.