Redirect from http://sitename.com to http://www.sitename.com

I am usi开发者_StackOverflow中文版ng ASP.NET 4. I want to do a 301 redirect from http://sitename.com to http://www.sitename.com.

What's the best way (and optional ways) to do it?

My site is also getting indexed on the ip address. How can I stop that.

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You could do a simple check in the Page_Load:

    protected void Page_Load(object sender, EventArgs e)
    {
        string serverName = HttpUtility.UrlEncode(Request.ServerVariables["SERVER_NAME"]); 
        string filePath = Request.FilePath;
        if (!serverName.ToLower().StartsWith("www.")) 
            serverName = "www." + serverName; 
        Response.Redirect("http://" + serverName + filePath); 
    }

Or you could add the following to the htaccess file:

Options +FollowSymlinks
RewriteEngine on
rewritecond %{http_host} ^domain.com [nc]
rewriterule ^(.*)$ http://www.domain.com/$1 [r=301,nc] 

Replacing domain.com and http://www.domain.com with your domain.

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I would do the 301 redirect at the IIS level, see this blog posting: SEO Canonical URLs And 301 Redirects In Windows IIS 6, IIS 7

To stop the site being indexed on the IP address, configure the "site" in IIS to have a host name, don't leave it blank.

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Depending on your DNS provider it may be possible for them to set up redirects usually called something like web forwards, web alias or web redirects. Just make sure it's a 301 not a frameset.

Related questions: Canonical name redirects in Godaddy?

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<rule name="Redirect to www">
  <match url="(.*)" />
  <conditions>
    <add input="{SERVER_PORT}" pattern="443" negate="true" />
  </conditions>
  <action type="Redirect" url="https://www.serdardemir.net/{R:1}" />
</rule>

you can use url rewrite add this rule to rules tag

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<rule name="Redirect to WWW" stopProcessing="true">
          <match url=".*" />
          <conditions>
            <add input="{HTTP_HOST}" pattern="^yoursite.com$" />
          </conditions>
          <action type="Redirect" url="http://www.yoursite.com/{R:0}" redirectType="Permanent" />
        </rule>

This code worked me. Add this in rules section of your web.config file