puoi usare web.config
qui è piegato bene come fare:
http://knowledge.freshpromo.ca/seo-t...php#web.config

The first example will redirect single pages to a new location. For example, important pages of your site have .htm extensions and you want the new location to be its own directory (IE. http://domain.com/services.htm will change to http://domain.com/services/).

1. Open web.config in the directory where the old pages reside
2. Then add code for the old location path and new destination as follows:

<configuration>
<location path="services.htm">
<system.webServer>
<httpRedirect enabled="true" destination="http://domain.com/services" httpResponseStatus="Permanent" />
</system.webServer>
</location>
<location path="products.htm">
<system.webServer>
<httpRedirect enabled="true" destination="http://domain.com/products" httpResponseStatus="Permanent" />
</system.webServer>
</location>
</configuration>

You may add as many location paths as necessary.The second example will redirect an entire directory to a new location. For example, if you want http://domain.com/olddir/ redirected to http://domain.com/newdir/ open web.config in /olddir and add the following line of code within the <system.webServer> section:

<httpRedirect enabled="true" destination="http://domain.com/newdir" httpResponseStatus="Permanent" />