Hi Mehram,

You need to call OnItemDataBound event and inside that you need to hide the header of the rows from 2nd onwords.

Refer below sample.

HTML 

<asp:DataList ID="dlFabric" runat="server" RepeatLayout="Table" RepeatColumns="2" RepeatDirection="Horizontal" OnItemDataBound="OnItemDataBound">
    <ItemTemplate>
        <table>
            <tr id="trHeader" runat="server">
                <th style="width: 100px;">Artical #
                </th>
                <th style="width: 100px;">Stock Qty
                </th>
            </tr>
            <tr>
                <td style="width: 100px;">
                    <asp:Label ID="lblTotalCount" runat="server" Text='<%#Eval("articalno") %>'></asp:Label>
                </td>
                <td style="width: 100px;">
                    <asp:Label ID="lblActiveMembersCount" runat="server" Text='<%#Eval("BalanceQty") %>'></asp:Label>
                </td>
            </tr>
        </table>
    </ItemTemplate>
</asp:DataList>

Namespace

C#

using System.Data;

Code

C#

protected void Page_Load(object sender, EventArgs e)
{
    if (!this.IsPostBack)
    {
        DataTable dt = new DataTable();
        dt.Columns.AddRange(new DataColumn[] {
                    new DataColumn("articalno"),
                    new DataColumn("BalanceQty") });
        dt.Rows.Add("1441", "1234");
        dt.Rows.Add("1567", "1896");
        dt.Rows.Add("1571", "1347");
        dt.Rows.Add("1231", "1977");
        dlFabric.DataSource = dt;
        dlFabric.DataBind();
    }
}

protected void OnItemDataBound(object sender, DataListItemEventArgs e)
{
    if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)
    {
        if (e.Item.ItemIndex >= dlFabric.RepeatColumns)
        {
            HtmlTableRow headerRow = (HtmlTableRow)e.Item.FindControl("trHeader");
            headerRow.Visible = false;
        }
    }
}

Screenshot