สอบถามปัญหาสร้าง textbox แบบ html บน ไฟล์ aspx

        Label1.Text = ""
        Label1.Text &= "<table border=1>"
        For i As Integer = 0 To CInt(TextBox4.Text) - 1
            Label1.Text &= "<tr><td>" & i & "</td><td><asp:TextBox ID='aaa" & i & "' runat='server'></asp:TextBox></td></tr>"
        Next
        Label1.Text &= "</table>"

Dim textbox(CInt(TextBox4.Text)) As TextBox

        Panel3.Controls.Add(New LiteralControl("<table>"))
        For i As Integer = 0 To CInt(TextBox4.Text) - 1
            Panel3.Controls.Add(New LiteralControl("<tr><td>" & i + 1 & "</td><td>"))
            textbox(i) = New TextBox
            textbox(i).ID = "aaa" & i
            Panel3.Controls.Add(textbox(i))
            Panel3.Controls.Add(New LiteralControl("</td></tr>"))
            'Panel3.Controls.Add(New LiteralControl("<br>"))
        Next
        Panel3.Controls.Add(New LiteralControl("</table>"))

Request.Form.Item("aaa" & i).ToString