public static bool SendEmail(
        string pGmailEmail,
        string pGmailPassword,
        string pTo,
        string pSubject,
        string pBody,
        System.Web.Mail.MailFormat pFormat,
        string pAttachmentPath)
        {
            try
            {
                System.Web.Mail.MailMessage myMail = new System.Web.Mail.MailMessage();
                myMail.Fields.Add
                    ("http://schemas.microsoft.com/cdo/configuration/smtpserver",
                                  "smtp.gmail.com");
                myMail.Fields.Add
                    ("http://schemas.microsoft.com/cdo/configuration/smtpserverport",
                                  "465");
                myMail.Fields.Add
                    ("http://schemas.microsoft.com/cdo/configuration/sendusing",
                                  "2");
                //sendusing: cdoSendUsingPort, value 2, for sending the message using 
                //the network.

                //smtpauthenticate: Specifies the mechanism used when authenticating 
                //to an SMTP 
                //service over the network. Possible values are:
                //- cdoAnonymous, value 0. Do not authenticate.
                //- cdoBasic, value 1. Use basic clear-text authentication. 
                //When using this option you have to provide the user name and password 
                //through the sendusername and sendpassword fields.
                //- cdoNTLM, value 2. The current process security context is used to 
                // authenticate with the service.
                myMail.Fields.Add
                ("http://schemas.microsoft.com/cdo/configuration/smtpauthenticate", "1");
                //Use 0 for anonymous
                myMail.Fields.Add
                ("http://schemas.microsoft.com/cdo/configuration/sendusername",
                    pGmailEmail);
                myMail.Fields.Add
                ("http://schemas.microsoft.com/cdo/configuration/sendpassword",
                     pGmailPassword);
                myMail.Fields.Add
                ("http://schemas.microsoft.com/cdo/configuration/smtpusessl",
                     "true");
                myMail.From = pGmailEmail;
                myMail.To = pTo;
                myMail.Subject = pSubject;
                myMail.BodyFormat = pFormat;
                myMail.Body = pBody;
                //if (pAttachmentPath.Trim() != "")
                //{
                //    MailAttachment MyAttachment =
                //            new MailAttachment(pAttachmentPath);
                //    myMail.Attachments.Add(MyAttachment);
                //    myMail.Priority = System.Web.Mail.MailPriority.High;
                //}

                System.Web.Mail.SmtpMail.SmtpServer = "smtp.gmail.com:465";
                System.Web.Mail.SmtpMail.Send(myMail);
                return true;
            }
            catch (Exception ex)
            {
                throw;
            }
}

            SendEmail("nickname@gmail.com",
                             "password",
                             "nick@bk.ru",
                             "This is email subject",
                             "This is email body",
                             System.Web.Mail.MailFormat.Text,
                             "");