Asp.net allow access only through routes?

问题:

I am using URL rewrite to make user-friendly URL's. So www.mysite.som/search is being handled by www.mysite/search.aspx correctly. But there is one more thing I want. I want to prevent direct access to my page search.aspx. So, if someone enters www.mysite.com/search.aspx, he should be redirected to www.mysite.com/search instead.

What have I tried?

<rewrite>
<rule name="Redirect to friendly" stopProcessing="true">
  <match url="^(.*)\.aspx$" />
  <action type="Redirect" url="{R:1}" />
</rule>
</rewrite>

But its not working.