VB.NET จะเช็คว่าหน้าเว็บเพจนี้มี Control Button ปุ่มกี่ปุ่มแต่ละปุ่มชื่ออะไรบ้าง ทำไงครับ

        For Each ctl As Control In Me.Controls
            If TypeOf ctl Is Button Then
                Dim b As Button = ctl
                Response.Write(b.ID)
            End If
        Next

Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
       
        For Each ctl As Control In Me.Controls
            If TypeOf ctl Is Button Then
                Dim b As Button = ctl
                Response.Write(b.ID)
            End If
        Next

    End Sub

For Each ctl As Control In Form.Controls

Next