try {
   string apiKey = "Your Secret Key";
   string emailToValidate = "example@example.com";
   string responseString = "";
   string apiURL = "https://api.zerobounce.net/v1/validate?apikey=" + apiKey + "&email=" +  HttpUtility.UrlEncode(emailToValidate);

   //Uncomment out to use the optional API with IP Lookup
   //string apiURL = "https://api.zerobounce.net/v1/validatewithip?apikey=" + apiKey + "&email=" +  HttpUility.UrlEncode(emailToValidate); + "&ipaddress=" + HttpUtility.UrlEncode("99.123.12.122")

   HttpWebRequest request = (HttpWebRequest)WebRequest.Create(apiURL);
   request.Timeout = 150000;
   request.Method = "GET";

   using (WebResponse response = request.GetResponse()) {
         response.GetResponseStream().ReadTimeout = 20000;
         using (StreamReader ostream = new StreamReader(response.GetResponseStream()))
         {
             responseString = ostream.ReadToEnd();
         }
       }
      } catch (exception ex) {
	Catch Exception - All errors will be shown here - if there are issues with the API
     }