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

public partial class ContactUs : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (IsPostBack)
        {
            string toAddress = "recipient@example.com";
            string subject = txtSubject.Text;
            string body = txtMessage.Text;

            // 创建一个SmtpClient实例，指定SMTP服务器的地址和端口
            SmtpClient smtpClient = new SmtpClient("smtp.yourmailprovider.com", 587);

            // 设置用于身份验证的凭据，如果SMTP服务器需要身份验证
            smtpClient.Credentials = new NetworkCredential("your_username", "your_password");

            // 启用SSL，如果SMTP服务器要求安全连接
            smtpClient.EnableSsl = true;

            // 创建邮件对象
            MailMessage mailMessage = new MailMessage("your_email@example.com", toAddress, subject, body);

            try
            {
                // 发送邮件
                smtpClient.Send(mailMessage);
                lblStatus.Text = "邮件发送成功!";
                lblStatus.CssClass = "success";
            }
            catch (Exception ex)
            {
                lblStatus.Text = "邮件发送失败: " + ex.Message;
                lblStatus.CssClass = "error";
            }
        }
    }
}