how to send a message to email after user login to account in asp.net

using System.Net;
using System.Net.Mail; 

public async Task SendMail(string recipientEmail, string senderEmail, string senderPassword, string senderName, string subject, string message)
        {
            try
            {
                MailMessage msg = new MailMessage();
                msg.From = new MailAddress(senderEmail, senderName);
                msg.To.Add(recipientEmail);
                msg.Subject = subject;
                msg.Body = message;
                msg.IsBodyHtml = true;
                
                SmtpClient smtp = new SmtpClient();
                smtp.Host = "mail.yourdomainname"; // e.g., mail.exampledomain.com
                System.Net.NetworkCredential nt = new NetworkCredential();
                nt.UserName = senderEmail; //Sender's Email Address  
                nt.Password = senderPassword; // Sender's Email Password  
                smtp.UseDefaultCredentials = true;
                smtp.Credentials = nt;
                smtp.Port = 25;
                smtp.EnableSsl = false;
              await smtp.SendMailAsync(msg);
            }
            catch (Exception)
            {

            }
        }

You can call the 'SendMail(...)' function after you login to send the mail.

I hope this is useful.