// the interface is used here as a jumpboard for kicking off the extension method (it works as a methodful role) instead of the traditional use of interfaces
public static void Submit(this SubmitModel self, EmailSender sender)
{
// The implementation of the use case by using the "primitive methods" of the domain objects
// validate email address in contactform data
// send an email to my gmail address with all contactform data
sender.SendMail(self.EmailAddress, "*****@*****.**", self.Subject, self.Body);
// display in the form View a disabled subject field when the call to this form is initiated by a CV request
}
