HTTP Status Codes Class

One of my apps required to graph and chart IIS logs. I of course was using logparser to do this and everything seemed to be working out. The request changed on me slightly so that I can define what the status code is as opposed to just saying the number of 404's or 200's. Here is an easy Dictionary class that you can use:

public class HttpStatusCodes
{
    static Dictionary _map = ConstructStatusCodesMap();

    public static string GetDescription(int statusCode)
    {
        string description = "";
        if (_map.ContainsKey(statusCode))
            description = _map[statusCode];

        return string.Format("{0} - {1}", statusCode, description);
    }

    private static Dictionary ConstructStatusCodesMap()
    {
        Dictionary map = new Dictionary();

        // http://status-code.com/
        #region Construct HTTP status codes map

        map.Add(100, "Continue");
        map.Add(101, "Switching Protocols");
        map.Add(102, "Processing");
        map.Add(200, "OK");
        map.Add(201, "Created");
        map.Add(202, "Accepted");
        map.Add(203, "Non-Authoritative Information");
        map.Add(204, "No Content");
        map.Add(205, "Reset Content");
        map.Add(206, "Partial Content");
        map.Add(207, "Multi-Status");
        map.Add(226, "IM Used");
        map.Add(300, "Multiple Choices");
        map.Add(301, "Moved Permanently");
        map.Add(302, "Found");
        map.Add(303, "See Other");
        map.Add(304, "Not Modified");
        map.Add(305, "Use Proxy");
        map.Add(306, "(Unused)");
        map.Add(307, "Temporary Redirect");
        map.Add(400, "Bad Request");
        map.Add(401, "Unauthorized");
        map.Add(402, "Payment Required");
        map.Add(403, "Forbidden");
        map.Add(404, "Not Found");
        map.Add(405, "Method Not Allowed");
        map.Add(406, "Not Acceptable");
        map.Add(407, "Proxy Authentication Required");
        map.Add(408, "Request Timeout");
        map.Add(409, "Conflict");
        map.Add(410, "Gone");
        map.Add(411, "Length Required");
        map.Add(412, "Precondition Failed");
        map.Add(413, "Request Entity Too Large");
        map.Add(414, "Request-URI Too Long");
        map.Add(415, "Unsupported Media Type");
        map.Add(416, "Requested Range Not Satisfiable");
        map.Add(417, "Expectation Failed");
        map.Add(418, "I'm a teapot");
        map.Add(422, "Unprocessable Entity");
        map.Add(423, "Locked");
        map.Add(424, "Failed Dependency");
        map.Add(425, "(Unordered Collection)");
        map.Add(426, "Upgrade Required");
        map.Add(500, "Internal Server Error");
        map.Add(501, "Not Implemented");
        map.Add(502, "Bad Gateway");
        map.Add(503, "Service Unavailable");
        map.Add(504, "Gateway Timeout");
        map.Add(505, "HTTP Version Not Supported");
        map.Add(506, "Variant Also Negotiates");
        map.Add(507, "Insufficient Storage");
        map.Add(510, "Not Extended");

        #endregion

        return map;
    }
}

Using it would be something like:

 return HttpStatusCodes.GetDescription((int)value);