How to send HTML Email from ASP.NET 2.0 via server that requires SMTP Authentication?

Here is an example on how to send email from ASPX page using a SMTP server that requires authentication:

Note: the code snippet assumes you have a Label component on Page with named lblMsg that will show
success/failure message to the user that is sending email.
(But this can be easily changed).

                SmtpClient client = new SmtpClient();

                client.DeliveryMethod = SmtpDeliveryMethod.Network;

                client.EnableSsl = true;

                client.Host = "smtp.yourmailserver.com";

                client.Port = 25;

                // setup Smtp authentication

                System.Net.NetworkCredential credentials = 
                       new System.Net.NetworkCredential("[email protected]", "yourpassword");

                client.UseDefaultCredentials = false;

                client.Credentials = credentials;

                MailMessage msg = new MailMessage();

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

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

                msg.Subject = "This is a test Email subject";

                msg.IsBodyHtml = true;

                msg.Body = string.Format("<html><head></head><body><b>Test HTML Email</b></body>");

try

                    client.Send(msg);

                    lblMsg.Text = "Your message has been successfully sent.";

                catch (Exception ex)

                    lblMsg.ForeColor = Color.Red;

                    lblMsg.Text = "Error occured while sending your message." + ex.Message;