hilite and zoom query in c#

[lakku]

iam working with mapserver using C# mapscript
iam displaying a map in imagebutton control
now i want to zoom the features on the map related to query
ie when user selects the layer and sub layer from dropdownlists and enters
the value in the textbox then related features must be hilited and zoomed on
the map
i have wriiten a code for only hiliting the features but it is not working
my code is :
ddlLayersQuery is the dropdownlist (layers)
ddlFieldsQuery is the dropdownlist (sublayers)
txtValue is the textbox
 Dim image As imageObj
        Dim img As Byte()
        Dim ms As MemoryStream
        Dim bitmap, mapimage As Bitmap
 Dim str, st, st1 As String
        str = ddlLayersQuery.SelectedItem.ToString
        layer = map.getLayerByName(str)
        st = ddlFieldsQuery.SelectedItem.ToString

        Try

            layer.queryByAttributes(map, st, txtValue.Text, 1)

        Catch ex As Exception

            MsgBox(ex.Message)
        End Try
        Try

            image = map.drawQuery()

            'image.save("mapimg.png", map)
            img = image.getBytes()
        Finally
            ms = New MemoryStream(img)

            mapimage = System.Drawing.Image.FromStream(ms)
            bitmap = mapimage
            bitmap.Save(Response.OutputStream,
System.Drawing.Imaging.ImageFormat.Jpeg)
        End Try


plz correct my code

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