How can i request.form generated textboxes?

hi there.. i have a long code which is used to generate dynamic textboxes on a page
i need to know how can i request the textboxes which were created dynamically
this is the code used to generate the textboxes
 
1 Private Sub GenerateTable(ByVal rowsCount As Integer)
2 Dim t1 As Table = New Table
3 Dim i As Integer = 0, j As Integer = 0
4 intSum = rowsCount
5 t1.ID = "Table1"
6 Page.Form.Controls.Add(t1)
7
8 For i = 0 To rowsCount
9 Dim r1 As TableRow = New TableRow
10
11 For j = 0 To 5
12 Dim tb As TextBox = New TextBox
13 Dim lb1 As Label = New Label
14 D ...