NHibernate + Unable to insert NULL value in

Question

I have an MS-SQL database with a table created using this code

CREATE TABLE [dbo].[portfoliomanager](
[idPortfolioManager] [int] NOT NULL PRIMARY KEY IDENTITY,
[name] [varchar](45) NULL
)

so idPortfolioManager is my primary key as well as auto-increment. Now in my Windows WPF application, I am using NHibernate to help with adding / updating / removing / etc. data from the database. Here is the class that should connect to the portfoliomanager table

namespace PortfolioManager
{
[Class(Table="portfoliomanager",NameType=typeof(PortfolioManagerClass))]
public class PortfolioManagerClass {

    [Id(Name = "idPortfolioManager")]
    [Generator(1, Class = "identity")] 
    public virtual int idPortfolioManager { get; set; }

    [NHibernate.Mapping.Attributes.Property(Name = "name")] 
    public virtual string name { get; set; }

    public PortfolioManagerClass() {
    }
}
}

and some short code to try to insert something

PortfolioManagerClass portfolio = new PortfolioManagerClass();
Portfolio.name = "Brad Portfolios";

The problem is that when I try to run this, I get this error:

{System.Data.SqlClient.SqlException: cannot insert a NULL value in the column 'idPortfolioManager', table 'PortfolioManagementSystem.dbo.portfoliomanager'; column does not allow null. INSERT fails. The application was interrupted ...

with external exception

{ " : [PortfolioManager.PortfolioManagerClass] [SQL:      portfoliomanager (name) VALUES (?); SCOPE_IDENTITY()]" }

, , NHibernate, - , . , Class= "native" unsaved-value = "0" . !

Edit:

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Answer 1

FYI, Fluent NHibernate. , NHibernate.