repost: how to access System.Search.QueryFocusedSummary

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C#

Hello,

I'm trying to read System.Search.QueryFocusedSummary from the SystemIndex.
I get a "column does not exist" error message. I am able to read other
columns such as: System.Search.AutoSummary.
I am using the Microsoft Windows Search 3.x SDK download
(Windows.Search.Interop.dll) on a Windows 7 operating System and Windows
Search 4.0.

My query is:

SELECT TOP 25 System.Search.QueryFocusedSummary From SystemIndex where <br />
CONTAINS('microsoft') ORDER BY System.ItemDate DESC

How can I get the query working with System.Search.QueryFocusedSummary?

The code is as follows:

using System;
using System.Collections;
using System.Collections.Generic;
using System.Data;
using System.Data.OleDb;
using System.IO;
using System.Security.Permissions;
using System.Text;
using Microsoft.Search.Interop;
 
namespace QueryFocusedSummaryTest
    {
    class Program
    [Stathread]
    static void Main(string[] args)
        {
        string sqlQuery = "select top 25 System.Search.QueryFocusedSummary from SystemIndex where contains('microsoft') order by System.ItemDate DESC";
        
        CSearchManager manager = new CSearchManager();
        ISearchCtalogManager catalogMaager = manager.GetCatalog("SystemIndex");
        ISearchQueryHelper queryHelper = catalogManager.GetQueryHelper();
        
        using (System.Data.OleDb.OleDbConnection conn = new OleDbConnection(queryHelper.ConnectionString))
            {
            conn.Open();
             
            using (OleDbCommand command = new OleDbCommand(sqlQuery, conn))
                {
                OleDbDataAdapter ds = new OleDbDataAdapter(command);
                DataSet ds = new DataSet();
                ds.Fill(ds);
                command.ExecuteNonQuery();
                //By now it has thrown the exception
                }
            }
        }
    } 

Thanks for any help you can give.