อยากถามวิธีการทำ MsgBox(Y or N) ปุ่ม Confirm ยืนยัน ขึ้นมาเมื่อเรากด Delete ใน GridView

Private Sub myGridView_RowDataBound(sender As Object, e As GridViewRowEventArgs) 

Dim btnDelete As Button = CType(e.Row.FindControl("btnDelete"),Label)
IF Not IsNothing(btnDelete) Then
btnDelete.Attributes.Add("Onclick", "return confirm('Do you delete...?');")
End IF

End Sub

protected void GridView1_RowDataBound(object sender, 
                         GridViewRowEventArgs e)
{
  if (e.Row.RowType == DataControlRowType.DataRow)
  {
    LinkButton l = (LinkButton)e.Row.FindControl("LinkButton1"); 
    l.Attributes.Add("onclick", "javascript:return " +
    "confirm('Are you sure you want to delete this record " +
    DataBinder.Eval(e.Row.DataItem, "CategoryID") + "')"); 
  }
}

Protected Sub GridView1_RowDataBound(sender As Object, e As GridViewRowEventArgs)
	If e.Row.RowType = DataControlRowType.DataRow Then
		Dim l As LinkButton = DirectCast(e.Row.FindControl("LinkButton1"), LinkButton)
		l.Attributes.Add("onclick", "javascript:return " & "confirm('Are you sure you want to delete this record " & DataBinder.Eval(e.Row.DataItem, "CategoryID") & "')")
	End If
End Sub