I think that you need extend querytask class:http://serverx.esri.com/ESRIBlogs/blogs/arcgisserver/archive/2007/05/03/Follow_2D00_up-to-Extending-the-QueryAttributes-Task_3A00_-Zooming-to-selected-features.aspxbut I advise you don't use adf because it's deprecated see http://blogs.esri.com/esri/arcgis/2011/09/30/update-to-arcgis-10-and-10-1-deprecation-plan/
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