hlite query

[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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