301 Redirect

Why do we need a 301 redirect?
I would say, if you have redesigned your website (may be you redesigned using the new .Net 3.5), may be reskinned etc etc...

Will I lose my page ranking if i implement 301 redirect?
No, you wont lose you page rank, 301 is the best method to preserve you page rank while redirecting the traffic to the new webpage.It usually takes 2 weeks for 301's to pass page rank and all related information. It is a SEO friendly redirection

How to implement it?
response.StatusCode = 301;
response.Status = "301 Moved Permanently";
response.RedirectLocation = http://www.newurl.com/;
response.End();

done!