How to build url where query string values are separated by +

[kkorus]

Hey, to to create url like:
http://google.com?/q=test+test

Because so far it's harcoded:

        /// <summary>
        /// Returns serialized, encoded query string. Insertion order is preserved.
        /// </summary>
        /// <returns></returns>
        public override string ToString()
        {
            return ToString(false);
        }