下面是使用ASP.NET发送电子邮件到Gmail账户的代码示例：

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

namespace EmailExample
{
    class Program
    {
        static void Main(string[] args)
        {
            // 发送方的电子邮件和密码
            string senderEmail = "your_email@gmail.com";
            string senderPassword = "your_password";

            // 第一个电子邮件的收件人和内容
            string recipientEmail1 = "recipient1@gmail.com";
            string subject1 = "Hello from ASP.NET";
            string body1 = "This is the first email sent using ASP.NET.";

            // 第二个电子邮件的收件人和内容
            string recipientEmail2 = "recipient2@gmail.com";
            string subject2 = "Hello again";
            string body2 = "This is the second email sent using ASP.NET.";

            // 创建SMTP客户端
            SmtpClient client = new SmtpClient("smtp.gmail.com", 587);
            client.EnableSsl = true;
            client.UseDefaultCredentials = false;
            client.Credentials = new NetworkCredential(senderEmail, senderPassword);

            try
            {
                // 发送第一个电子邮件
                MailMessage message1 = new MailMessage(senderEmail, recipientEmail1, subject1, body1);
                client.Send(message1);
                Console.WriteLine("First email sent successfully.");

                // 发送第二个电子邮件
                MailMessage message2 = new MailMessage(senderEmail, recipientEmail2, subject2, body2);
                client.Send(message2);
                Console.WriteLine("Second email sent successfully.");
            }
            catch (Exception ex)
            {
                Console.WriteLine("Error sending email: " + ex.Message);
            }
        }
    }
}

请确保将your_email@gmail.com和your_password替换为您自己的Gmail帐户电子邮件和密码。请注意，这段代码使用了Gmail的SMTP服务器，并且要求您的Gmail帐户启用了SMTP访问权限。

此代码将创建一个SMTP客户端并发送两个独立的电子邮件到不同的Gmail收件人。第一个电子邮件的主题是"Hello from ASP.NET"，内容是"This is the first email sent using ASP.NET."。第二个电子邮件的主题是"Hello again"，内容是"This is the second email sent using ASP.NET."。

如果发送成功，控制台将显示"First email sent successfully."和"Second email sent successfully."。如果发送过程中出现错误，控制台将显示错误消息。