What is the advantage of the Response.RedirectPermanent() method in ASP.NET 4.0?
When a web page has moved permanently, it is recommended to use the Response.RedirectPermanent method in ASP.NET 4.0.
ASP.NET 4 when IIS is reset
Meta Tags using the Page Directives
Response.Redirect(), Response.RedirectPermanent(), Server.Transfer()
Shrinking Session State
Expanding size of allowable URL
Preventing XSS Attacks in ASP.NET 4
New features in ASP.NET 4.0
Features of ASP.NET 4.0 Chart Control
Advantage of Response.RedirectPermanent()
Benefit of Extensible Output Caching
Controlling IDs of Controls
Monitor Performance in ASP.NET 4.0
The advantage is that the search engines will take this a permanent redirection (Status 301) and will remove old page from its cache/database, and include new page for better performance on search.