public class CustomWebClient : WebClient
    {
        public CustomWebClient() { }
        protected override WebRequest GetWebRequest(Uri address)
        {
            var request = base.GetWebRequest(address) as HttpWebRequest;
            request.UserAgent =
                "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/61.0.3163.100 Safari/537.36";
            request.Host = address.Host;
            request.Accept = "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8";
            request.Referer = "https://www.google.ru/";
            request.Headers["Accept-encoding"] = "gzip, deflate";
            request.Headers["Accept-language"] = "ru-RU,ru;q=0.8,en-US;q=0.6,en;q=0.4";
            request.Headers["Upgrade-insecure-requests"] = "1";
            request.Headers["Cookie"] = "__utma=45462011.1937116378.1507035093.1507035093.1507035093.1; __utmb=45462011.2.10.1507035093; __utmc=45462011; __utmz=45462011.1507035093.1.1";
            request.AutomaticDecompression = DecompressionMethods.Deflate | DecompressionMethods.GZip;
            request.Timeout = request.ContinueTimeout = request.ReadWriteTimeout = 30000;
            return request;
        }
    }

//src.Url = https://www.kidsreview.ru/msk/catalog/kulturnye-otdykh-i-razvlecheniya/gde-otmetit-detskii-den-rozhdeniya-v-moskve

                using (var wc = new CustomWebClient())
                {
                    wc.Encoding = Encoding.UTF8;
                    var body = wc.DownloadString(src.Url);
                }