Question

I have this code to delete contact from my database and I have got this error:No persister for: System.Int32

protected void Button1_Click(object sender, EventArgs e)
{

  NHibernate.Cfg.Configuration config = new NHibernate.Cfg.Configuration();

  config.AddAssembly("ContactDomain");

  NHibernate.ISessionFactory factory = config.BuildSessionFactory();
  NHibernate.ISession session = factory.OpenSession();

  NHibernate.ITransaction transaction = session.BeginTransaction();

  Contact contact = new Contact();
  int contactid = 1;

  session.Delete(contactid);

  transaction.Commit();
  session.Close();
}

I have this code for creating new contact and it’s working:

protected void btnSaveContact_Click(object sender, EventArgs e)  
{
   NHibernate.Cfg.Configuration config = new NHibernate.Cfg.Configuration();

   config.AddAssembly("ContactDomain");

   NHibernate.ISessionFactory factory = config.BuildSessionFactory();
   NHibernate.ISession session = factory.OpenSession();

   NHibernate.ITransaction transaction = session.BeginTransaction();

   Contact contact = new Contact();

   contact.FirstName = txtFirstName.Text;
   contact.LastName = txtLastName.Text;
   contact.Email = txtEmail.Text;
   contact.Telephone = txtTelephone.Text;

   session.Save(contact);
   transaction.Commit();
   session.Close();
}

Answer 1

You cannot delete an entity that is not saved! try:

Contact contact = new Contact();
int contactid = 1; //are you managing manually entity id?


session.SaveOrUpdate(contact);

session.Delete(contact);

update

Contact contact=session.Get<Contact>(1);

session.Delete(contact);