asp.net good config and practices

fingerprint.cs

//Stolen from @mkristensen 
//Use to bust static content like .js and .css when they changed.
using System.IO;
using System.Web;
using System.Web.Caching;
using System.Web.Hosting;

namespace CHANGE_YOUR_NAMESPACE_HERE
{
    public class Fingerprint
    {
        public static string Tag(string rootRelativePath)
        {
            if (HttpRuntime.Cache[rootRelativePath] == null)
            {
                var absolute = HostingEnvironment.MapPath("~" + rootRelativePath);
                var date = File.GetLastWriteTime(absolute);
                var index = rootRelativePath.LastIndexOf('/');
                var result = rootRelativePath.Insert(index, "/v-" + date.Ticks);
                HttpRuntime.Cache.Insert(rootRelativePath, result, new CacheDependency(absolute));
            }

            return HttpRuntime.Cache[rootRelativePath] as string;
        }
    }
}

partial.web.config

<system.webserver>
    <!-- ensure gzip on both static and javascript, etc. -->
    <urlCompression doStaticCompression="true" doDynamicCompression="true" />

    <!-- long expiry cache for static contents -->
    <staticContent>
      <clientCache cacheControlMode="UseMaxAge" cacheControlMaxAge="365.00:00:00" />
    </staticContent>
    
    <!-- url rewriting to strip of the versioning to break the long expiry cache on static contents -->
    <rewrite>
      <rules>
        <rule name="fingerprint">
          <match url="([\S]+)(/v-[0-9]+/)([\S]+)" />
          <action type="Rewrite" url="{R:1}/{R:3}" />
        </rule>
      </rules>
    </rewrite>
</system.webserver>