protected void SubmitBtn_Click(object sender, EventArgs e)
{
    if (Page.IsValid)
    {
        StringBuilder mailBody = new StringBuilder();
        mailBody.Append("Company Name: " + companyText.Text.Trim() + "nn");
        mailBody.Append("Name: " + firstNameText.Text.Trim() + " "
            + lastNameText.Text.Trim() + "nn");
        mailBody.Append("Email: " + emailText.Text.Trim() + "nn");

        if(!String.IsNullOrEmpty(tradeText.Text))
            mailBody.Append("Trade: " + tradeText.Text.Trim() + "nn");

            bool success = SendEmail(emailText.Text.Trim(),
                companyText.Text.Trim(), "SubContractors Form Submission",
                    mailBody.ToString());
    }
}

private bool SendEmail(string email, string name,
    string subject, string message)
{
    using (MailMessage mail = new MailMessage())
    {
        mail.From = new MailAddress(BlogSettings.Instance.Email, name);
        mail.ReplyTo = new MailAddress(email, name);

        mail.To.Add(BlogSettings.Instance.Email);
        mail.Subject = subject;
        mail.Body += message;

        if (Utils.SendMailMessage(mail).Length > 0)
        {
            return false;
        };
    }
    return true;
}

mail.Body += message.Replace("nn", "<br />");

mailBody.Append("Email: " + emailText.Text.Trim() + Environment.NewLine);

StringBuilder mailBody = new StringBuilder();

string company = companyText.Text.Trim();
string firstName = firstNameText.Text.Trim();
string lastName = lastNameText.Text.Trim();
string email = emailText.Text.Trim();
string trade = tradeText.Text.Trim();

mailBody.AppendFormat("Company Name: {0}", company).AppendLine();
mailBody.AppendFormat("Name: {0} {1}", firstName, lastName).AppendLine();
mailBody.AppendFormat("Email: {0}", email).AppendLine();

if(!string.IsNullOrEmpty(trade))
{
    mailBody.AppendFormat("Trade: {0}", trade).AppendLine();
}

bool success = SendEmail(email, company, "SubContractors Form Submission",
    mailBody.ToString());