HttpClient .net Core add Certificate

Module m = Assembly.GetEntryAssembly().GetModules()[0];
using (var cert = m.GetSignerCertificate())
using (var cert2 = new X509Certificate2(cert))
{
   var _clientHandler = new HttpClientHandler();
   _clientHandler.ClientCertificates.Add(cert2);
   _clientHandler.ClientCertificateOptions = ClientCertificateOption.Manual;
   var myModel = new Dictionary<string, string>
   {
       { "property1","value" },
       { "property2","value" },
   };
   using (var content = new FormUrlEncodedContent(myModel))
   using (var _client = new HttpClient(_clientHandler))
   using (HttpResponseMessage response = _client.PostAsync($"{url}/{controler}/{action}", content).Result)
   {
       response.EnsureSuccessStatusCode();
       string jsonString = response.Content.ReadAsStringAsync().Result;
       var myClass = JsonConvert.DeserializeObject<MyClass>(jsonString);
    }
}