strange datagrid error

I want to use datagridpaging, so I have set the allowpaging propertie to TRUE.
Then I use the following code to fill the grid with the next page :

Private Sub dgRoute_PageIndexChanged(ByVal source As Object, ByVal e As System.Web.UI.WebControls.DataGridPageChangedEventArgs) Handles dgRoute.PageIndexChanged


Try
Response.Write("testing 1,2,3")

dgRoute.CurrentPageIndex = e.NewPageIndex

DgFiller()

Catch ex As Exception

Response.Write(ex.Message)

End Try

end sub


because the response.write is not written to the page I think that somehow the sub is totaly ignored?
Does anybody knwow what causes this problem?


Krol