Listview sorting based on dropdownlist in asc or desc

<asp:dropdownlist id="ddlDirection" runat="server" xmlns:asp="#unknown">
AutoPostBack="true" onselectedindexchanged="ddlDirection_SelectedIndexChanged1">
<asp:listitem selected="True" text="Ascending">ASC</asp:listitem>
<asp:listitem text="Descending">DESC</asp:listitem>
</asp:dropdownlist>

the codebehind will be something on the following lines

 protected void ddlDirection_SelectedIndexChanged1(object sender, EventArgs e)
    {
        string sortBy = ddlSortBy.SelectedValue; //any string u want to sort (name etc)
        string direction = ddlDirection.SelectedValue;
        SortProducts(sortBy, direction);
    }

 protected void SortProducts(string sortBy, string direction)
    {
        string filter = sortBy + " " + direction;
        DataTable newDt = new DataTable();
        newDt = (DataTable)Session["ProductsDt"];

        dt = newDt.Clone();

        DataRow[] drArray = null;

        drArray = newDt.Select("", filter);

        foreach (DataRow dr in drArray)
        {
            dt.ImportRow(dr);
        }

        MyListView.DataSource = dt;
        MyListView.DataBind();
    }