Want to execute function in our website automatically

This entire application can be configured to run in once in a month.
http://www.iopus.com/guides/winscheduler.htm
http://support.microsoft.com/kb/308569
 

private void GetDbDetails()
{
  ///do your db operation here.  then call the sendMail funtion
SendMail("DB Details info")
}
 
private void SendMail(string MailDetails)
      {
        // System.Web.Mail.SmtpMail.SmtpServer is obsolete in 2.0
        // System.Net.Mail.SmtpClient is the alternate class for this in 2.0
        SmtpClient smtpClient = new SmtpClient();
        MailMessage message = new MailMessage();
        try
        {
            MailAddress fromAddress = new MailAddress(txtEmail.Text, txtName.Text);
            // You can specify the host name or ipaddress of your server
            // Default in IIS will be localhost
            smtpClient.Host = "localhost";
            //Default port will be 25
            smtpClient.Port = 25;
            //From address will be given as a MailAddress Object
            message.From = fromAddress;
            // To address collection of MailAddress
            message.To.Add("[email protected]");
            message.Subject = "Feedback";
            // CC and BCC optional
            // MailAddressCollection class is used to send the email to various users
            // You can specify Address as new MailAddress("[email protected]")
            message.CC.Add("[email protected]");
            message.CC.Add("[email protected]");
            // You can specify Address directly as string
            message.Bcc.Add(new MailAddress("[email protected]"));
            message.Bcc.Add(new MailAddress("[email protected]"));
            //Body can be Html or text format
            //Specify true if it  is html message
            message.IsBodyHtml = false;
            // Message body content
            message.Body = MailDetails;
    
        
            // Send SMTP mail
            smtpClient.Send(message);
            lblStatus.Text = "Email successfully sent.";
        }
        catch (Exception ex)
        {
            lblStatus.Text = "Send Email Failed." + ex.Message;
        }
      }
Please refer the following links also.
http://www.codeproject.com/KB/aspnet/EmailApplication.aspx
http://www.4guysfromrolla.com/articles/072606-1.aspx
http://weblogs.asp.net/scottgu/archive/2005/12/10/432854.aspx
http://www.codeproject.com/KB/vb/SendMail.aspx
Hope this helps you.