是否可以对服务同时使用证书和UserName凭据类型？C#

using System;
using System.Net.Http;
using System.Security.Cryptography.X509Certificates;

public class Program
{
    public static void Main()
    {
        // 设置证书
        X509Certificate2 certificate = new X509Certificate2("path_to_certificate.pfx", "certificate_password");
        ServicePointManager.ClientCertificates.Add(certificate);

        // 设置用户名和密码凭据
        string userName = "your_username";
        string password = "your_password";
        string base64Credentials = Convert.ToBase64String(System.Text.Encoding.ASCII.GetBytes($"{userName}:{password}"));
        HttpClient client = new HttpClient();
        client.DefaultRequestHeaders.Authorization = new System.Net.Http.Headers.AuthenticationHeaderValue("UserName", base64Credentials);

        // 发送请求
        HttpResponseMessage response = client.GetAsync("https://example.com/api").Result;
        string result = response.Content.ReadAsStringAsync().Result;
        Console.WriteLine(result);
    }
}