/// <summary>
        /// Adds the initerstialel ad.
        /// </summary>
        /// <param name="adUnitID">Ad unit identifier.</param>
        public void InitIniterstialelAd(string adUnitID)
        {
            this.AdUnitID = adUnitID;
#if __ANDROID__
            try
            {
                mInterstitialAd.AdUnitId = adUnitID;
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
            }
            mInterstitialAd.AdListener = new AdListener();
#elif __IOS__

            // Intersitials must be re-instantiated each time
            // the ad's are loaded.
#endif
            LoadIniterstialelAd();
        }