JavaScript and CSS Caching using CRC32

using System.IO;
using System.Web;

namespace WebCRC
{
    public static class CRC
    {
        public static string Content(this System.Web.Mvc.UrlHelper Url, string Path, bool CRC)
        {
            if (!CRC)
                return Url.Content(Path);

            string serverPath = HttpContext.Current.Server.MapPath(Path);
            byte[] fileContents = File.ReadAllBytes(serverPath);
            string result = CRC32.Compute(fileContents).ToString("X");
            return Url.Content(Path) + "?crc=" + result;
        }
    }
}