ToQueryString

/// <summary>
        /// Converts a dictionary object to a query string representation such as:
        /// firstname=shannon&lastname=deminick
        /// </summary>
        /// <param name="d"></param>
        /// <returns></returns>
        public static string ToQueryString(this IDictionary<string, object> d)
        {
            if (!d.Any()) return "";

            var builder = new StringBuilder();
            foreach(var i in d)
            {
                builder.Append(String.Format("{0}={1}&", i.Key, i.Value));
            }
            return builder.ToString().TrimEnd('&');
        }