try
            {
                string addressSender = this.textBox5.Text;

                //System.Web.Mail.SmtpMail. SMTPClient = null;
                System.Web.Mail.MailMessage message = new System.Web.Mail.MailMessage();
                try
                {
                    message.Subject = "Test SMTP Parameter CLASSE WEB MAIL";
                    message.Body = "Email inviata in automatico. Non rispondere a questa email";
                    message.From = addressSender;
                    message.To = this.textBox6.Text;


                    int p = 25;
                    Int32.TryParse(this.textBox2.Text, out p);

                    if (this.checkBox2.Checked)
                    {
                        message.Fields["http://schemas.microsoft.com/cdo/configuration/smtpauthenticate"] = 1;
                        message.Fields["http://schemas.microsoft.com/cdo/configuration/sendusername"] = this.textBox3.Text;
                        message.Fields["http://schemas.microsoft.com/cdo/configuration/sendpassword"] = this.textBox4.Text;
                    }

                    System.Web.Mail.SmtpMail.SmtpServer = this.textBox1.Text;
                    System.Web.Mail.SmtpMail.Send(message);
                   
                }
                catch (Exception ex)
                {
                    this.textBox7.Text = this.textBox7.Text + "\r\n\r\n" + ex.InnerException.Message;
                }
            }
            catch (Exception exx)
            {
                this.textBox7.Text = this.textBox7.Text + "\r\n\r\n" + exx.InnerException.Message;
            }