public string NotifyBookDeadline()
{
string message = "";
db.Configuration.ProxyCreationEnabled = false;
var dateTime = DateTime.UtcNow.AddDays(-1);
var getBookLogs = db.BookLogs.Where(b => b.Return == false).Where(b => b.Deadline >= dateTime && b.Deadline <= DateTime.UtcNow).ToList();
foreach (var log in getBookLogs)
{
message = message + SMTP.SendNotification(log.Id);
}
return(message);
}