I am having a problem when databinding a gridview to an IList of results from nHibernate.  When the first item in the list is not a proxy object, it works fine.  But if it is a proxy object, I get this error:
Code:
  TargetInvocationException: Property accessor 'Username' on object 'ThisProject.Domain.Model.Implementations.User' threw the following exception:'Object does not match target type.'
My code is pretty simple:
Code:
  IList<User> users = _userRepository.GetUsersForSite(currentSite.Id);
  gvUsers.DataSource = users;
  gvUsers.DataBind();
My mapping file:
Code:
<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" namespace="ThisProject.Domain.Model.Implementations" assembly="ThisProject.Domain" default-access="field.camelcase-underscore"  >
  <class name="User" table="Users" dynamic-update="true">
    <id name="Id" column="user_id" type="Int32">
      <generator class="identity" />
    </id>
    <property name="Username" type="String" insert="false" update="false"/>
    <property name="FirstName" column="name_first" insert="false" update="false" />
    <property name="LastName" column="name_last" insert="false" update="false"  />
    <property name="MiddleName" column="name_middle" insert="false" update="false" />
    <property name="Suffix" column="name_suffix" insert="false" update="false" />
    <property name="PhoneNumber" column="phone" insert="false" update="false" />
    <property name="FaxNumber" column="fax" insert="false" update="false" />
    <property name="EmailAddress" column="email" insert="false" update="false" />
    <property name="JobTitle" column="job_title" insert="false" update="false" />
    <property name="IsActive" column="is_active" insert="false" update="false" />
    <property name="DealerID" column="dlrcode" insert="false" update="false" />
    <bag name="AccessibleSites" table="users_sites" cascade="none" lazy="true">
      <key column="user_id" />
      <many-to-many column="site_id" class="ThisProject.Domain.Model.Implementations.Site, ThisProject.Domain"/>
    </bag>
  </class>
</hibernate-mapping>