using Persits.MailSender in C#

I am trying to write a new page using Persits in C#. My code

object Mail;
Mail = Server.CreateObject("Persits.MailSender");
Mail.Host = "localhost";

throws an error:

Compiler Error Message: CS0117: 'object' does not contain a definition for 'Host'

and I don't know why. What am I doing wrong?

 

Perfect! Thank you...