using (var client = new HttpClient())
   {
      var ValueCollection = ....;
      var formContent = new FormUrlEncodedContent(ValueCollection);
      HttpResponseMessage response = client.PostAsync(action,  formContent).Result;
      logger.Fatal("Line: 131 - : " + await      response.Content.ReadAsStringAsync());
      ...   do something else ...
   }

[HttpPost]
    [ActionName("login-password")]
    public object Login([FromBody] LoginViewModel param)
    {
        logger.Fatal("Login with: " + param.username + " - pw: " +    param.password);
         ... Get user and return user.
    }