Send mail in c#

// using this code in send mail button Onclick event



string username = //your name

                string answer = null;

                string mail = null;

               

              

                    MailMessage msg = new MailMessage();

                    msg.From = new MailAddress("...."); //from mail id

                    msg.To.Add(".."); //to mail id

                    msg.Subject = "sample test";

                    msg.Body = "UserName:" + username + ";

                    SmtpClient smtp = new SmtpClient("smtp.gmail.com");

                    smtp.EnableSsl = true;

                    smtp.Port = 25; // your smtp port number here 

                   System.Net.NetworkCredential SMTPUserInfo = new System.Net.NetworkCredential("//user mail id", "//user password");



                    try

                    {

                        smtp.UseDefaultCredentials = false;

                        smtp.Credentials = SMTPUserInfo;

                        smtp.Send(msg);

                        ScriptManager.RegisterStartupScript(this.Page, this.GetType(), "Alert", "alert('Your Password has been sent to your Email id')", true);

                    }

                    catch (Exception exe)

                    {

                        Response.Write(exe.Message.ToString());

                    }