Hi,
Some of your objects are not serializable, so we can't use ASP.net state service to store session data like emails. We must use inproc mode, but, as you know, with inproc mode, if the w3wp service stops or il the application stops, then all session data are lost. Then, all unsaved user data are lost. That is why we like to use asp.net state service.
Will you modifiy your objects so they can be serialized?
[SerializationException: Type 'Aspose.Network.Mail.MailMessage' in Assembly 'Aspose.Network, Version=6.4.0.0, Culture=neutral, PublicKeyToken=ad504e9f0d34714a' is not marked as serializable.]
Best regards,