public static string Unsubscribe(string guid)
{
string email = string.Empty;
Newsletter_Send_Item newsletterSendItem = NewsletterDAL.GetNewsletterSendItemByGuid(guid);
if (newsletterSendItem != null && newsletterSendItem.SendToContactId != null && newsletterSendItem.SendToContactId > 0)
{
NewsletterDAL.UnsubscribeNewsletterItem(newsletterSendItem);
ContactBLL.Unsubscribe(newsletterSendItem.SendToContactId);
email = newsletterSendItem.Email;
}
return(email);
}