Sending mail to multiple person

//Create an object of MailMessage class

    MailMessage message = new MailMessage();       

//Assign the MessageFromEmailID i.e. sender's EmailID

    message.From = new MailAddress("[email protected]");    

//Add the MessageToEmailID i.e. recipient's EmailID

    message.To.Add(new MailAddress("[email protected]"));     

//Assign the subject of the email

    message.Subject = "Email Subject";       

    message.IsBodyHtml = true;   

//Assign the body of the email i.e. the message to be sent

    message.Body = "Message to be sent";                    

//Create an object of SmtpClient by passing ur SMTP Server name and SMTP port to be used. By default port 25 can be used.

    SmtpClient objSMTP = new SmtpClient("SMTPHost", "SMTPPort");          

    objSMTP.UseDefaultCredentials = true;      

//Call the Send  method of SmtpClient object and pass the MailMessage object, while will finally send the email message to the recipient's emailID

    objSMTP.Send(message);

The marked in the bold letter is the place to add the recipient mail address. If you want to send in one shot then you need to iterate the db list users email id in the  message.To.Add property.

If you have string array then