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Hibernate version:

Mapping documents:
<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.0" namespace="WebApplication3" assembly="WebApplication3">
<class class="cls" table="cls" lazy="true">
<id name="Num" column="Num" type="Int32" unsaved-value="0">
<generator class="assigned" />
</id>

</class>
</hibernate-mapping>

Code between sessionFactory.openSession() and session.close():

Full stack trace of any exception that occurs:

Name and version of the database you are using:

The generated SQL (show_sql=true):

Debug level Hibernate log excerpt:

first I should be thankfull of those answered my questions!
my problem in web application is that NHibernate don't find through the assembly any resources that end with .hbm.xml .
I have related xml files which are compiled into the assembly as Embedded Resources. I don't what is wrong?

I have a class named cls.cs and an xml file named cls.hbm.xml;
you can see my xml file above

cfg.AddClass(typeof(WebApplication3.cls));
the above line throw bellow error:

Exception Details: System.Xml.XmlException: The XML declaration is unexpected. Line 1, position 4.

I get confused because the same codes works correctly in windows application.