Reference an object using string (the object is under the tab control) - vb.net

Question

I have a working code here that can put test to all textboxes from 1 to 10. The name of the textboxes are Tb_Hour_1, Tb_Hour_2, Tb_Hour_3, Tb_Hour_4, etc. up to 10.
Dim textboxes As TextBox
For i As Integer = 1 To 10
textboxes = Me.Controls("TB_Hour_" & i)
textboxes.Text = "Test" & i
Next
But the problem comes in when I put my text boxes under the tab control, by searching I've found out that by adding in I can specify the place of the object that I want to call. Here's the working code.
For Each c As TextBox In TabPage1.Controls.OfType(Of TextBox)()
If c.Text = String.Empty Then c.Text = "a"
Next
My question is how can I integrate the 2 codes so I can have something like this
Dim textboxes As TextBox In TabPage1.Controls.OfType(Of TextBox)()
For i As Integer = 1 To 10
textboxes = Me.Controls("TB_Hour_" & i)
textboxes.Text = "Test" & i
Next

Answer 1

My VB is a little rusty, but it should be something like this. You can loop through all of the controls on the tab, look for ones that starts with "TB_Hour_", cast it to a textbox and do whatever it is you want to do.
For Each c As Control In TabPage1.Controls
If c.Name.StartsWith("TB_Hour_") Then
' it's a textbox
Dim tb as Textbox = DirectCast(c, Textbox)
' do whatever you're going to do
End If
Next

Answer 2

Now that you tucked the TextBoxes into a TabContol, don't use Me.Controls(). Instead try:
Dim textboxes As TextBox
For i As Integer = 1 To 10
textboxes = TabPage1.Controls("TB_Hour_" & i)
textboxes.Text = "Test" & i
Next
Otherwise, you can do something like:
Dim textboxes As TextBox
For i As Integer = 1 To 10
textboxes = Me.TabControl1.Controls("TabPage1").Controls("TextBox" & i)
textboxes.Text = "Test" & i
Next