301 redirect, www redirect, domain redirect

First create a web.config file in your root directory if it's not already there.  Second, put the following code into your web.config file.

Case1: 301 redirect domain.com to www.domain.com
  <?xml version="1.0" encoding="UTF-8"?> <configuration>     <system.webServer>         <rewrite>             <rules>                 <rule name="Canonical Host Name" stopProcessing="true">   <match url="(.*)" />   <conditions>     <add input="{HTTP_HOST}" pattern="^domain\.com$" />   </conditions>   <action type="Redirect" url="http://www.domain.com/{R:0}" redirectType="Permanent" />                 </rule>              </rules>         </rewrite>     </system.webServer> </configuration>
Case2: 301 redirect all domains to one domain name
  <?xml version="1.0" encoding="UTF-8"?> <configuration> <system.webServer> <rewrite>     <rules>         <rule name="Enforce canonical hostname" stopProcessing="true">             <match url="(.*)" />             <conditions>                 <add input="{HTTP_HOST}" negate="true" pattern="^www\.domain\.com$" />             </conditions>             <action type="Redirect" url="http://www.domain.com/{R:0}" redirectType="Permanent" />         </rule>     </rules> </rewrite> </system.webServer> </configuration>