FormにtblMainていうIDのテーブルがあること前提（<table id="tblMain" runat ="server">）
実行結果：ttp://up2.viploader.net/upphp/src/vlphp037983.png

With Me.tblMain
.Rows.Clear() '一旦全初期化
Dim dr As HtmlTableRow
Dim cell As HtmlTableCell
Dim txt As TextBox
For i As Integer = 0 To 10
dr = New HtmlTableRow
cell = New HtmlTableCell
cell.InnerText = i.ToString
dr.Cells.Add(cell)

txt = New TextBox
txt.ID = "txtBox_" & i.ToString
txt.Text = "テキストボックス" & i.ToString
cell = New HtmlTableCell
cell.Controls.Add(txt)
dr.Cells.Add(cell)

.Rows.Add(dr)
Next
End With

勘違いして・・・る？