Assume a situation where we want to redirect users to a newly developed page if current page is obsolete, we can use Response.Redirect to shift the page to a new page. But in this case, search engines keep the old information of the page in their indexes for search. Also, if a user navigates to this page, he would be redirected to this page and then to a new page with the help of Response.Redriect.
But in ASP.NET 4.0, a new command Response.RedirectPermanent can be used to change the header information for the page on the server. So, if a user goes for a page, he is directly redirected to new page and it saves a double trip for him.
Similarly, search engines, on re-indexing of that website and page, finds the updated header and updates the information in their index and shows the updated information on search.
