Linq to Entities: Getting the current selected row column to update the detail grid.

 private void GridViewPage_SelectionChanged( object sender, EventArgs e )
    {
      PageID = Convert.ToInt32( GridViewPage[ "page_id", GridViewPage.CurrentRow.Index ].Value.ToString() );
      
      var pageImageListQuery = from pi in re.page_image
                               join i in re.images
                               on pi.image_id equals i.image_id
                               join pit in re.page_image_type
                               on pi.pit_id equals pit.pit_id
                               where pi.page_id == PageID
                               select new
                               {
                                 i.image_data, pi.pi_id, pi.page_id,
                                 pi.alt_text, i.image_id, pit.pit_id,
                                 pit.pit_name, i.image_description,
                                 pi.image_desc, pi.image_order,
                                 i.width, i.height, i.file_date
                               };

      if ( GridViewPageImage.DataSource != null )
      {
        GridViewPageImage.DataSource = null;
        GridViewPageImage.DataSource = pageImageListQuery;
      }       
    }