protected void SendEmail(object sender, EventArgs e)
    {
        using (MailMessage mm = new MailMessage("shemeshr27@gmail.com", "shemeshr27@gmail.com"))
        {
            mm.Subject = "New deal";
            string passenger1 = DropDownList1.SelectedValue.ToString() + " First name:" + FirstName1.Text + " Last name:" + LastName1.Text + "Passport" + PassportCode1.Text + "Birth date :" + Day1.Text + "." + DropDownList5.SelectedValue.ToString() + "." + Year1.Text;
            string passenger2 = DropDownList2.SelectedValue.ToString() + " First name:" + FirstName2.Text + " Last name:" + LastName2.Text + "Passport" + PassportCode2.Text + "Birth date :" + Day2.Text + "." + DropDownList6.SelectedValue.ToString() + "." + Year2.Text;
            string passenger3 = DropDownList3.SelectedValue.ToString() + " First name:" + FirstName3.Text + " Last name:" + LastName3.Text + "Passport" + PassportCode3.Text + "Birth date :" + Day3.Text + "." + DropDownList7.SelectedValue.ToString() + "." + Year3.Text;
            string passenger4 = DropDownList4.SelectedValue.ToString() + " First name:" + FirstName4.Text + " Last name:" + LastName4.Text + "Passport" + PassportCode4.Text + "Birth date :" + Day4.Text + "." + DropDownList8.SelectedValue.ToString() + "." + Year4.Text;
            mm.Body = passenger1+" || "+passenger2+" || "+passenger3+" || "+passenger4;
           /* if (fuAttachment.HasFile)
            {
                string FileName = Path.GetFileName(fuAttachment.PostedFile.FileName);
                mm.Attachments.Add(new Attachment(fuAttachment.PostedFile.InputStream, FileName));
            }*/
            mm.IsBodyHtml = false;
            SmtpClient smtp = new SmtpClient();
            smtp.Host = "smtp.gmail.com";
            smtp.EnableSsl = true;
            NetworkCredential NetworkCred = new NetworkCredential("shemeshr27@gmail.com","0545242526");
            smtp.UseDefaultCredentials = true;
            smtp.Credentials = NetworkCred;
            smtp.Port = 587;
            smtp.Send(mm);
            ClientScript.RegisterStartupScript(GetType(), "alert", "alert('Email sent.');", true);
        }
    }