What is the best way to loop this program? - vb.net

Question

This is one of the form, all the usercontrol value in this form will store in My.Settings
I have another form with a FlowLayoutPanel, everytime when the application start,
if Active checked then it will add a Button with discount value to the FlowLayoutPanel.
Should I add those usercontrol to a list and then loop through the list? Or what is the best way to solve this kind of problem?
UPDATED
How can I add multiple item to list in 1 code? I getting this error when system run to line 5
An exception of type 'System.NullReferenceException' occurred in XXX.exe but was not handled in user code
Additional information: Object reference not set to an instance of an object.
Public Sub RefreshDiscount(ByRef ref As scr_mainDiscount)
Dim li_disName As New List(Of TextBox)
Dim li_disValue As New List(Of TextBox)
Dim li_disType As New List(Of ComboBox)
Dim li_active As New List(Of CheckBox)
Dim tb_disName As TextBox() = {ref.tb_name1, ref.tb_name2, ref.tb_name3, ref.tb_name4, ref.tb_name5, ref.tb_name6, ref.tb_name7, ref.tb_name8, ref.tb_name9, ref.tb_name10}
Dim tb_disValue As TextBox() = {ref.tb_value1, ref.tb_value2, ref.tb_value3, ref.tb_value4, ref.tb_value5, ref.tb_value6, ref.tb_value7, ref.tb_value8, ref.tb_value9, ref.tb_value10}
Dim cb_disType As ComboBox() = {ref.cb_type1, ref.cb_type2, ref.cb_type3, ref.cb_type4, ref.cb_type5, ref.cb_type6, ref.cb_type7, ref.cb_type8, ref.cb_type9, ref.cb_type10}
Dim chkb_active As CheckBox() = {ref.CheckBox1, ref.CheckBox2, ref.CheckBox3, ref.CheckBox4, ref.CheckBox5, ref.CheckBox6, ref.CheckBox7, ref.CheckBox8, ref.CheckBox9, ref.CheckBox10}
li_disName.AddRange(tb_disName)
li_disValue.AddRange(tb_disValue)
li_disType.AddRange(cb_disType)
li_active.AddRange(chkb_active)
For index As Integer = 0 To li_active.Count - 1
If li_active(index).Checked = False Then
li_disName.RemoveAt(index)
li_disValue.RemoveAt(index)
li_disType.RemoveAt(index)
li_active.RemoveAt(index)
Else
Dim btn As New ctrl_DiscountButton
With btn
.Text = li_disName(index).Text
.Price = li_disValue(index).Text
.Type = li_disType(index).Text
End With
scr_sales.flp_discount.Controls.Add(btn)
End If
Next
li_disName.Clear()
li_disValue.Clear()
li_disType.Clear()
li_active.Clear()
End Sub

Answer 1

Here's a simple example showing how to find CheckBox1 thru CheckBox10, "by name", using the "searchAllChildren" option of Controls.Find():
For i As Integer = 1 To 10
Dim ctlName As String = "CheckBox" & i
Dim matches() As Control = Me.Controls.Find(ctlName, True)
If matches.Length > 0 AndAlso TypeOf matches(0) Is CheckBox Then
Dim cb As CheckBox = DirectCast(matches(0), CheckBox)
' do something with "cb"
If cb.Checked Then
' ... code ...
' possibly use code just like this to find the matching discount value control?
End If
End If
Next