Attempted to read or write protected memory. This is often an indication that other memory is corrupt.

The inner exception is:
An exception of type 'NHibernate.ADOException' occurred in method 'DoList' of class 'Loader'

The stack trace given is:
   at NHibernate.Loader.Loader.DoList(ISessionImplementor session, QueryParameters queryParameters) in C:\Documents and Settings\test\Desktop\NHibernate-1.2.1.GA-src\src\NHibernate\Loader\Loader.cs:line 1803
   at NHibernate.Loader.Loader.ListIgnoreQueryCache(ISessionImplementor session, QueryParameters queryParameters) in C:\Documents and Settings\test\Desktop\NHibernate-1.2.1.GA-src\src\NHibernate\Loader\Loader.cs:line 1745
   at NHibernate.Loader.Loader.List(ISessionImplementor session, QueryParameters queryParameters, ISet querySpaces, IType[] resultTypes) in C:\Documents and Settings\test\Desktop\NHibernate-1.2.1.GA-src\src\NHibernate\Loader\Loader.cs:line 1733
   at NHibernate.Impl.SessionImpl.Find(CriteriaImpl criteria, IList results) in C:\Documents and Settings\test\Desktop\NHibernate-1.2.1.GA-src\src\NHibernate\Impl\SessionImpl.cs:line 4963
   at NHibernate.Impl.SessionImpl.Find[T](CriteriaImpl criteria) in C:\Documents and Settings\test\Desktop\NHibernate-1.2.1.GA-src\src\NHibernate\Impl\SessionImpl.cs:line 4914
   at NHibernate.Impl.CriteriaImpl.List[T]() in C:\Documents and Settings\test\Desktop\NHibernate-1.2.1.GA-src\src\NHibernate\Impl\CriteriaImpl.cs:line 323

The inner exception is:
An exception of type 'System.AccessViolationException' occurred in method 'Read' of class 'OpsDac'

The stack trace given is:
   at Oracle.DataAccess.Client.OpsDac.Read(IntPtr opsConCtx, IntPtr opsErrCtx, IntPtr opsSqlCtx, IntPtr& opsDacCtx, OpoSqlValCtx* pOpoSqlValCtx, OpoMetValCtx* pOpoMetValCtx, OpoDacValCtx* pOpoDacValCtx) 
   at Oracle.DataAccess.Client.OracleDataReader.Read() 
   at NHibernate.Loader.Loader.DoQuery(ISessionImplementor session, QueryParameters queryParameters, Boolean returnProxies) in C:\Documents and Settings\test\Desktop\NHibernate-1.2.1.GA-src\src\NHibernate\Loader\Loader.cs:line 440 
   at NHibernate.Loader.Loader.DoQueryAndInitializeNonLazyCollections(ISessionImplementor session, QueryParameters queryParameters, Boolean returnProxies) in C:\Documents and Settings\test\Desktop\NHibernate-1.2.1.GA-src\src\NHibernate\Loader\Loader.cs:line 181 
   at NHibernate.Loader.Loader.DoList(ISessionImplementor session, QueryParameters queryParameters) in C:\Documents and Settings\test\Desktop\NHibernate-1.2.1.GA-src\src\NHibernate\Loader\Loader.cs:line 1793

public void Main()
{
    //Placeholder for saving ID of new record that is saved through ADO.
    decimal static ADOSavedObjectID;

    ADONewTestRecord obj = new ADONewTestRecord();

    //ADO.NET code to save this returns saved object db ID.
    ADOSavedObjectID = SaveThroughADO(obj);

    //Fetch the Saved record through NHibernate.
    TestNewRecordFromNHibernate = GetTestRecordThroughNHibernate(ADOSavedObjectID)

    public decimal SaveThroughADO(ADONewTestRecord obj)
    {
    //ADO code.
    }

    public TestNewRecordFromNHibernate GetTestRecordThroughNHibernate(decimal ADOSavedObjectID)
    {
        return LoadNHibernateObject(ADOSavedObjectID);
    }

    public TestNewRecordFromNHibernate LoadNHibernateObject(decimal ADOSavedObjectID)
    {
        //NHibernate session is already opened, i am not providing details.
        Session.Clear();
        IList<TestNewRecordFromNHibernate> results;
        ICriteria criteria = Session.CreateCriteria(typeof (TestNewRecordFromNHibernate));
                criteria.Add(Expression.Eq("ID", ADOSavedObjectID));
        //In this line i get the reported exception see above.
        results = criteria.List<TestNewRecordFromNHibernate>();
        return results[0];
    }
}