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If you want to retrieve some value from a database you always has to use a class that shall contain a lot of data.

In my case, I want to retrieve one value only from a stored procedure and do I really need to use a class that shall contain a single value only?
How should I create inside of the .hbm.xml and how should I write in c# code when I dont want to use a class?

It is not a IList<string> or similiar. A single value only that is int string.

The code below is used when you need to have class that shall contain a lot of data.

<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" assembly="data_layer" namespace="data_layer">
  <sql-query name="sp_retrieveAllProductList">
    <return-scalar column="Produkt" type="string" />
    <return-scalar column="Produkt_kategori" type="string" />
    <return-scalar column="btn_namn" type="string" />
    exec sp_retrieveAllProductList :Produkt_kategori

public IList<Product4> RetrieveAllProductWithPriceNameAndBtn()
        return _session.GetNamedQuery("sp_retrieveAllProductList2")

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace data_layer
    public class Product4
        public virtual string PK_produkt { get; set; }
        public virtual string Produkt { get; set; }
        public virtual string Produkt_kostnad { get; set; }
        public virtual string btn_namn { get; set; }
Updated 28-May-14 20:36pm

See How to: Create and Execute an SQL Statement that Returns a Single Value[^] for information on how to execute an SQL statement that returns a single value.
deelll 28-May-14 18:15pm
Thank you for your help. I want to use it in relation to Nhibernate
Try this if you want to get a list of string

IList<string> names = Session.CreateSQLQuery("EXEC sp_retrieveAllProductList2")			

If you want to return a single value

deelll 29-May-14 2:32am
Thank you for your help. It is not a list. it is a single value only without any IList<string>. int string only
soumyajayaraj 29-May-14 2:59am
I have updated the answer for returning a single value.
deelll 30-May-14 9:10am
How about the hbm.xml file? How should the return-scalar be written?

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