301 Moved Permanently Redirect in ASP.NET

If you have done SEO work, you know that Search Engines would penalize my site if both http://www.mysite.com and http://mysite.com/ requests returned a 200 OK code in the HTTP header. Why? Because from a Search Engine's spider point of view, there are 2 sites, one with the www prefix, and one without it, yet in reality they the same site.

The solution for this is to do a 301 Redirect.

You can do this:

protected void Page_Load(object sender, EventArgs e)

{

   Response.Status = "301 Moved Permanently" ;

   Response.AddHeader( "Location" ,"http://www.mysite.com" );

}

But this code needs to be applied on every webpage.

 So a general solution to overcome this problem is writting the code in global.asax file's Application_BeginRequest event and the code will looks like:

void Application_BeginRequest(object sender, EventArgs e)

    {

        if (HttpContext.Current.Request.Url.ToString().ToLower().Contains("http://mysite.com"))

        {

            HttpContext.Current.Response.Status = "301 Moved Permanently";

            HttpContext.Current.Response.AddHeader("Location", Request.Url.ToString().ToLower().Replace("http://mysite.com", "http://www.mysite.com"));

        }

    }

So now if you type http://mysite.com you will get 301 Moved Permanently instead of 200 OK and site will automatically redirect to http://www.mysite.com. The new result means the Search Engines will consider both urls to point to the same site, so all page rankings will add up regardless of the entry point.