I have found a great articles to do Search engine optimization for ASP.NET websites.
it will discuss regarding view state and meta tags of asp.net .
If you’re developing for the Web then you should familiarize yourself with some Search Engine Optimization or SEO concepts. The idea here is to make your ASP.NET application as friendly as possible for spiders, and the specific spider we’re talking about is Google.
Here is the link for that :
http://www.wwwcoder.com/tabid/68/type/art/parentid/457/site/6173/default.aspx