private void buttonBack_Click(object sender, EventArgs e)
 {
     staticVar = this;
     this.Hide();
     FormInbox formInbox = new FormInbox();
     formInbox.Show();
 }
        private void buttonsend_Click(object sender, EventArgs e)
        {
            SmtpClient client = new SmtpClient("smtp.gmail.com", 587);
            client.Credentials = new NetworkCredential("*****@*****.**", "N53SN53S");
            MailMessage msg = new MailMessage();
            msg.From = new MailAddress(textBoxFrom.Text);
            msg.To.Add(new MailAddress(textBoxTo.Text));
            msg.Subject = textBoxSub.Text;
            msg.Body = textBoxBody.Text;
            try
            {
                client.Send(msg);
            }
            catch(Exception ex)
            {
                MessageBox.Show("blabla: " + ex.Message);
            }

            staticVar = this;
            this.Hide();
            FormInbox formInbox = new FormInbox();
            formInbox.Show();
        }