问Javascript不能在ClientScriptManager内部触发

EN

Private Sub ShowWarning(ByVal ID As Integer)

    Dim ds As DataSet = reminders.getJuryPaymentDueEvent(ID)
    If ds.Tables(0).Rows.Count > 0 Then
        Dim cs As ClientScriptManager = Page.ClientScript
        Dim script As String = "javascript:confirm('There is a record and  it will be deleted')"
        cs.RegisterStartupScript(Page.GetType(), "confirm", script, True)
    End If
End Sub


 Private Sub btnSave_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnSave.Click

   If hasorder() then  'there is other function which works fine
        ShowWarning(ID)
        'if confirm return ture
        deleteOrder()
  end if
End Sub