If we are redirecting from one page to another page, using Response.Redirect will send "302" status code, this results in SEO issues. To improve SEO performance, sending "301" status code will be helpful. In .NET 4.0 framework Response.RedirectPermanent method is provided. However, if we are using the framework before 4.0, we can use below script.
Response.Status = "301 Moved Permanently"; Response.AddHeader("Location","/modules/4/whatisnew/471/net-framework-40.aspx?tab=tags&tn=category");