Launch Secured Node-Red dashboard (UI) from C# or ASP.NET APP

Hello everyone,
image

is there possible to login this form via alternative code or web form ui?

string url = "http://40.87.141.219:1880/ui"; // Node-RED sunucu adresinizi ve port numarasını girin
string username = "user";
string password = "areytech";

    using (HttpClient client = new HttpClient())
    {
        // Kullanıcı adı ve şifreyi Base64 ile kodlama
        string base64Auth = Convert.ToBase64String(Encoding.ASCII.GetBytes($"{username}:{password}"));

        // "Authorization" başlığını ekleyin
        client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Basic", base64Auth);

        // GET isteği oluşturun (örnek olarak)
        HttpResponseMessage response = await client.GetAsync(url);

        if (response.IsSuccessStatusCode)
        {
            string responseContent = await response.Content.ReadAsStringAsync();
            Console.WriteLine("Response: " + responseContent);
        }
        else
        {
            Console.WriteLine("Request failed with status code: " + response.StatusCode);
        }
}

This is my login code but, always get fault,

what i try to do, if i make login with c# application, than there is no required to login again,
is it possible with basic auth?