ASP.NET thead create table with thead using code behind

using my existing code below how can i incorp thead

<table><thead><tr><td></td></tr></table>

 

Dim c As New TableCell
            Dim r As New TableRow
            Dim D As New TableRow

 c = New TableCell
                c.Text = "te"
                r.Style.Add("text-align", "center")
                c.Style.Add("width", "70px")
                c.Style.Add("border-bottom", "black 1px solid")
                r.Cells.Add(c)

                c = New TableCell
                c.Text = "Item"
                r.Style.Add("text-align", "center")
                c.Style.Add("width", "40px")
                c.Style.Add("border-bottom", "black 1px solid")
                'c.ColumnSpan = 3
                r.Cells.Add(c)
 Trade.Rows.Add(r)

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