我如何使用Gmail的SMTP客户端在c#中发送电子邮件给我自己，而不启用Gmail设置中不太安全的应用程序的访问?

我正在做一个ASP。. NET Web表单应用程序，我试图以编程方式发送电子邮件给自己。我正在使用Gmail的SMTP客户端，一切都很好，除了当我发送邮件时，我得到了这个错误:

"System.Net.Mail。SmtpException: SMTP服务器要求安全连接或客户端未经过身份验证。服务器响应为:5.5.1认证要求。了解更多

如果我进入我的gmail帐户设置并启用一个允许我访问"不太安全的应用程序"的选项，一切都很好。我想知道如何在启用此选项的情况下发送电子邮件。

protected void sendEmail(object sender, EventArgs e)
{
    var client = new SmtpClient("smtp.gmail.com", 587)
    {
        Credentials = new System.Net.NetworkCredential("myusername@gmail.com", "mypassword"),
        DeliveryMethod = SmtpDeliveryMethod.Network,
        EnableSsl = true
    };
    
    MailAddress from = new MailAddress("myusername@gmail.com", "Torchedmuffinz");
    MailAddress to = new MailAddress("myusername@gmail.com", "Torchedmuffinz");
    MailMessage message = new MailMessage(from, to);
    message.Subject = "test";
    message.Body = "test";
    Attachment attachFile = new Attachment(@"pathtofile");
    message.Attachments.Add(attachFile);
    try { client.Send(message); }
    catch (Exception email_exception)
    {
        System.Diagnostics.Debug.WriteLine(email_exception);
    }
}

MailMessage msg = new MailMessage();
msg.From=new MailAddress("yourmail@gmail.com");
msg.To.Add("receiver@receiverdomain.com");
msg.Subject="Your Subject";
msg.Body="Message content is going to be here";
msg.IsBodyHtml=false; //if you are going to send an html content, you have to make this true
SmtpClient client = new SmtpClient("smtp.gmail.com");
client.Port=587;
NetworkCredential credential=new NetworkCredential("yourmail@gmail.com","your gmail password");
client.UseDefaultCredentials=false;
client.Credentials=credential;
client.Send(msg);