How to limit page access only to localhost?

Is there a way in asp.net to limit the access to a web page only from localhost?

     if (!HttpContext.Current.Request.IsLocal)
     { 
       Response.Status = "403 Forbidden";
       Response.End();
     }

If you want to do this for a "web page" then I'd use IsLocal, but if you want a subdirectory solution I'd use Url Rewrite 2. http://www.microsoft.com/web/gallery/install.aspx?appid=urlrewrite2. If you don't have this installed already, go and get it as it's very useful. I believe it will be standard on IIS8.

Then add this to your web.config under <system.webServer/>

<rewrite>
 <rules>
    <!-- if this rule matches stopProcessing any further rules -->
    <rule name="Block Remote Access to Admin" stopProcessing="true" patternSyntax="ECMAScript" enabled="true">
      <!-- specify secure folder matching trailing / or $ == end of string-->
      <match url="projects(/|$)" ignoreCase="true" />
      <conditions logicalGrouping="MatchAll">
        <!-- Allow local host -->
        <add input="{REMOTE_ADDR}" pattern="localhost" ignoreCase="true" negate="true" />
        <add input="{REMOTE_ADDR}" pattern="127.0.0.1" negate="true" />
        <add input="{REMOTE_ADDR}" pattern="::1" negate="true" />
      </conditions>
      <!-- by default, deny all requests. Options here are "AbortRequest" (drop connection), "Redirect" to a 403 page, "CustomResponse", etc.  -->
      <action type="CustomResponse" statusCode="403" statusDescription="Forbidden" statusReason="Access to this URL is restricted"/>
      <!-- or send the caller to an error page, home page etc
           <action type="Redirect" url="/public/forbidden.htm" redirectType="Temporary" />
      -->
    </rule>
  </rules>
</rewrite>