private void ButtonSend_Click(object sender, EventArgs e) { try { SmtpClient client = new SmtpClient("smtp.gmail.com", 587); client.EnableSsl = true; client.Timeout = 10000; client.DeliveryMethod = SmtpDeliveryMethod.Network; client.UseDefaultCredentials = false; client.Credentials = new NetworkCredential("*****@*****.**", "Asd@1234"); MailMessage msg = new MailMessage(); msg.To.Add(textBoxTo.Text); msg.From = new MailAddress("*****@*****.**"); msg.Subject = textBoxSubject.Text; msg.Body = textBoxContent.Text; client.Send(msg); MessageBox.Show(string.Format("Successful send to {0}", textBoxTo.Text)); Model.FoodStock foodId = new Model.FoodStock(id, false); foodId.ValidToSendEmail(); this.Close(); } catch (Exception exp) { MessageBox.Show(exp.Message); } }