Nhibernate <version> feature not working -

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i have started working nhibernate. have found pretty till have hit issue unable solve. appreciated.

i trying use "version" feature implement optmistic locking. below mapping file , portion of code related class. problem no matter how many times modify field, "version" column on database not updated.

my mapping file:

<?xml version="1.0" encoding="utf-8" ?> <hibernate-mapping xmlns="urn:nhibernate-mapping-2.2"                    namespace="mytest"                    assembly ="mytest">   <class name="project" table="dbo.m_project">     <id name="projectid" type="int32" unsaved-value="null">       <column name="projectid" sql-type="int" not-null="true" unique="true" />       <generator class="native" />     </id>     <version name="version" column="version"/>     <property name="projectname" type="string">       <column name="projectname" length="100" sql-type="nvarchar" not-null="true"/>     </property>     <property name="updated" type="bool">       <column name="updated" sql-type="bit" not-null="true"/>     </property>     <property name="noofitemswithexceptions" type="int">       <column name="noofitemswithexc" sql-type="int" not-null="true"/>     </property>     <property name="menustate" type="int">       <column name="menustate" sql-type="int" not-null="true"/>     </property>     <property name="initialized" type="bool">       <column name="initialized" sql-type="bit" not-null="true"/>     </property>     <property name="inventoryrun" type="bool">       <column name="inventoryrun" sql-type="bit" not-null="true"/>     </property>     <property name="productionforecastrun" type="bool">       <column name="productionforecastrun" sql-type="bit" not-null="true"/>     </property>     <property name="monthlyupdate" type="bool">       <column name="monthlyupdate" sql-type="bit" not-null="true"/>     </property>     <bag name="skulist" table="dbo.p_sku" inverse="true" lazy="true" cascade="save-update">       <key column="projectid" />       <one-to-many         class="sku"/>     </bag>   </class> </hibernate-mapping>

the associated version property:

    private int _version;     public virtual int version     {         { return _version; }         set { _version = value; }     }

thanks!

it might necessay explicity set optimistic-lock attribute (in theory it's not). instance 

<class name="project" table="dbo.m_project" optimistic-lock="dirty">

here have more info it


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