<hibernate-mapping  auto-import="true" default-lazy="false" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="urn:nhibernate-mapping-2.2">
  <class name=WebUser, Web" table="WebUser">
    <id name="WebUserID" access="property" column="WebUserID" type="Int32" unsaved-value="0">
      <generator class="SerialIdentifierGenerator, Web">
      </generator>
    </id>
    <version name="Version" access="field.camelcase-underscore" column="Version" type="Int32" />
    <property name="ModifyDate" access="property" type="System.DateTime">
      <column name="ModifyDate"/>
    </property>
    <property name="UserID" access="property" type="Int32">
      <column name="UserID"/>
    </property>
    <property name="UserName" access="property" type="String">
      <column name="UserName"/>
    </property>
    <property name="Password" access="property" type="String">
      <column name="Password"/>
    </property>
    <property name="FirstName" access="property" type="String">
      <column name="FirstName"/>
    </property>
    <property name="LastName" access="property" type="String">
      <column name="LastName"/>
    </property>
    <property name="EmailAddress" access="property" type="String">
      <column name="EmailAddress"/>
    </property>
    <property name="SecurityFlags" access="property" type="Int32">
      <column name="SecurityFlags"/>
    </property>
    <property name="LastLogin" access="property" type="System.DateTime">
      <column name="LastLogin"/>
    </property>
    <property name="PasswordHint" access="property" type="String">
      <column name="PasswordHint"/>
    </property>
    <property name="SecureQuestion1" access="property" type="String">
      <column name="SecureQuestion1"/>
    </property>
    <property name="SecureAnswer1" access="property" type="String">
      <column name="SecureAnswer1"/>
    </property>
    <property name="SecureQuestion2" access="property" type="String">
      <column name="SecureQuestion2"/>
    </property>
    <property name="SecureAnswer2" access="property" type="String">
      <column name="SecureAnswer2"/>
    </property>
    <property name="CreationTime" access="property" type="System.DateTime">
      <column name="CreationTime"/>
    </property>
    <bag name="WebUserAccounts" access="nosetter.camelcase-underscore" table="WebUserAccount" lazy="false" inverse="true" cascade="save-update">
      <key column="WebUserID" />
      <one-to-many class="WebUserAccount, Web" />
    </bag>
  </class>
</hibernate-mapping>

<hibernate-mapping  auto-import="true" default-lazy="false" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="urn:nhibernate-mapping-2.2">
  <class name="WebUserAccount, Web" table="WebUserAccount">
    <id name="WebUserAccountID" access="property" column="WebUserAccountID" type="Int32" unsaved-value="0">
      <generator class="SerialIdentifierGenerator, Web">
      </generator>
    </id>
    <version name="Version" access="field.camelcase-underscore" column="Version" type="Int32" />
    <property name="ModifyDate" access="property" type="System.DateTime">
      <column name="ModifyDate"/>
    </property>
    <property name="UserID" access="property" type="Int32">
      <column name="UserID"/>
    </property>
    <property name="SecurityFlags" access="property" type="Int32">
      <column name="SecurityFlags"/>
    </property>
    <property name="AccountID" access="property" type="Int32">
      <column name="AccountID"/>
    </property>
    <many-to-one name="WebUser" access="property" class="WebUser, Web" column="WebUserID" />
  </class>
</hibernate-mapping>

foreach (WebUser toDelete in WebUser.FindAll())
                  {
                     toDelete.WebUserAccounts.Clear();
                     toDelete.Delete();
                  }