抛光服务器上的WPF电子邮件发送错误

Question

这是电子邮件发送的代码，但它没有给出任何结果，没有错误，在调试器中也没有警报：

public void EmailSending()
{
    try
    {
        SmtpClient smtp = new SmtpClient("poczta.silesianet.pl", 587);
        smtp.Timeout = 20000;
        smtp.EnableSsl = true;
        smtp.DeliveryMethod = SmtpDeliveryMethod.Network;
        smtp.UseDefaultCredentials = false;
        NetworkCredential Credentials = new NetworkCredential("userName", PB_AddPassword.Password, "https://poczta.silesianet.pl/");
        smtp.Credentials = Credentials; 
        MailMessage message = new MailMessage("from@mail","to@mail");
        message.Subject = "Topic:"
        message.IsBodyHtml = true;
        message.Body = "Body";
        IntPtr accountToken = WindowsIdentity.GetCurrent().Token;
        smtp.SendAsync(message, accountToken);
   }
        catch (Exception ex)
        {
            MessageBox.Show(ex.Message, "Error", MessageBoxButton.OK, MessageBoxImage.Error);
        }
    }

这是密码的代码，但有些东西也是错误的，因为它不记得它：

private void PB_AssPassword_TextInput(object sender, TextCompositionEventArgs e)
{
    string Pass= PB_AssPassword.Password;
    hasło = Environment.GetEnvironmentVariable("Pass");

    if (Pass== null)
    {
        Environment.SetEnvironmentVariable("Pass", "Value1");
    }
}

有人可以帮我吗？