public static bool SendEmail(string sBody, string RagioneSociale)
{
    MailAddress from = new MailAddress(ConfigurationManager.AppSettings["MailFrom"], ConfigurationManager.AppSettings["DisplayName"]);
    MailAddress to = new MailAddress(ConfigurationManager.AppSettings["MailTo"]);
    using (MailMessage message = new MailMessage(from, to))
    {
        message.Subject = string.Format("Richiesta di preventivo da {0}", RagioneSociale);
        message.Priority = MailPriority.High;
        message.IsBodyHtml = true;
        message.Body = sBody;
        NetworkCredential credential = new NetworkCredential(ConfigurationManager.AppSettings["UserName"], ConfigurationManager.AppSettings["Password"]);
        SmtpClient client = new SmtpClient(ConfigurationManager.AppSettings["SMTPAddress"]);
        client.Credentials = credential;
        client.UseDefaultCredentials = false;
        try
        {
            client.Send(message);
        }
        catch
        {
            return false;
        }
        return true;
    }
}