How to add a header column with the column span of 20 columns to my datatable in gridview.

|       Header Column           |      Header Column2      |
|apple|Microsoft|Android|Dell|HP|Targus|Stack Overflow|Acer|

Dim dt As New DataTable
dt.Clear()
    dt.Columns.Add("apple")
    dt.Columns.Add("Microsoft")
Dim mr As DataRow
    mr = dt.NewRow
    mr("apple") = "Macbook"
    mr("Microsoft") = "Surface Pro"
dt.Rows.Add(mr)
GridView1.DataSource = dt
GridView1.DataBind()