Send Bulk email using smtp gmail in asp.net

/////

// add Namespace

        //using System.Threading.Tasks;

// Call send email

public static bool SendEmail_Bulk()

    {

        datatable dt=new datatble();

        dt=Fill datatable;

        Parallel.ForEach(dt.AsEnumerable(), row =>

          {

               SendEmail(row["Email"].ToString(), subject, string.Format(body, row["Name"]));

           });

}

// .cs page

public static bool SendEmail_Bulk(string SenderName,string AddressTo, string subject, string body,string CC,string BCC)

    {

        //using System.Threading.Tasks;

        //Parallel.ForEach(dt.AsEnumerable(), row =>

        //   {

        //       SendEmail(row["Email"].ToString(), subject, string.Format(body, row["Name"]));

        //   });

        bool isSuccess = false;

        try

        {

            string[] Credentials = { "gmail@gmail.com", "AppPassword", "Password" };

            MailMessage mail = new MailMessage();

            mail.IsBodyHtml = true;

            SmtpClient SmtpServer = new SmtpClient("smtp.gmail.com");

            mail.From = new MailAddress(Credentials[0], SenderName);

            mail.To.Add(AddressTo);

            mail.Subject = subject;

            mail.Body = body;

            mail.BodyEncoding = Encoding.UTF8;

            mail.IsBodyHtml = true;

            if (CC != "")

            {

                mail.CC.Add(CC);

            }

            if (BCC != "")

            {

                mail.Bcc.Add(BCC);

            }          

            SmtpServer.Port = 587;

            SmtpServer.Credentials = new System.Net.NetworkCredential(Credentials[0], Credentials[1]);

            SmtpServer.EnableSsl = true;

            SmtpServer.Send(mail);

            isSuccess = true;

        }

        catch (Exception ex)

        {

            // log the exception

        }

        return isSuccess;

    }