how to forget password through gmail server in asp.net and c#

public string GetRandomString(int length)
        {
            System.Random rnd = new Random();
            //string charPool = "abc890defghijkl1234mnopqrstuvwxyz567";
            string charPool = "ABC890DEFGHIJKL1234MNOPQRSTUVWXYZ567";
            System.Text.StringBuilder rs = new System.Text.StringBuilder();
            while (length-- > 0)
                rs.Append(charPool[(int)(rnd.NextDouble() * charPool.Length)]);
            return rs.ToString();
        }

if(true)
{
           MailAddress mailfrom = new MailAddress ( "frommail@gmail.com" );
            MailAddress mailto = new MailAddress ( "tomail@gmail.com" );
            MailMessage newmsg = new MailMessage ( mailfrom, mailto );

            newmsg.Subject = "Subject of Email";
            newmsg.Body = "Body(message) of email";

            ////For File Attachment, more file can also be attached

            //Attachment att = new Attachment ( "G:\\code.txt" );
            //newmsg.Attachments.Add ( att );

            SmtpClient smtps = new SmtpClient ( "smtp.gmail.com", 587 );
            smtps.UseDefaultCredentials = false;
            smtps.Credentials = new NetworkCredential ( "mail@gmail.com", "pwd" );
            smtps.EnableSsl = true;
            smtps.Send ( newmsg );
}
else
  Label.Text="the email id is does not exist";