Change ip address c# on web client request

I want change my ip address before send web request to server without using proxy

using (var wb = new WebClient())
        {
            string json = "{}";

            var data = new NameValueCollection();
            data["jsonObject"] = json;

            var response = wb.UploadValues("http://----.com/api/product/insert", "POST", data);
            string responseInString = Encoding.UTF8.GetString(response);
        }