Listview to excel mso-number-format:\@; dont work

Hello!

I want to export listview to Excel. It is necessary that the Excel  recognize first column as the text. I will make so, but it don't work

<style type="text/css">
   .text {mso-number-format:\@; }</style><asp:ListView ID="ListView1" runat="server" DataSourceID="SqlDataSource1"
            onitemdatabound="ListView1_ItemDataBound"><LayoutTemplate><table id="Table1" runat="server" cellpadding="2" border="1" cellspacing="0"><tr id="Tr1" runat="server" ><td id="Td1" runat="server" class="text">Number</td><td id="Td2" runat="server">Name</td><td id="Td7" runat="server">Price</td></tr><tr id="ItemPlaceholder" runat="server"></tr></table>  </LayoutTemplate><ItemTemplate><tr><td><asp:Label ID="Label1" runat="server" Text='<%#Eval("id") %>'></asp:Label></td><td><%#Eval("Name") %></td><td><%#Eval("Price") %></td></tr></ItemTemplate></asp:ListView>

protected void ListView1_ItemDataBound(object sender, ListViewItemEventArgs e)
    {
        Label text = (Label)e.Item.FindControl("Label1");
        string id = text.Text;
        if (id.Length == 1) {text.Text = "00000" + text.Text; }
        if (id.Length == 2) { text.Text = "0000" + text.Text; }
        if (id.Length == 3) { text.Text = "000" + text.Text; }
        if (id.Length == 4) { text.Text = "00" + text.Text; }
        if (id.Length == 5) { text.Text = "0" + text.Text; }
        ListView1.DataBind();
        System.IO.StringWriter sw = new System.IO.StringWriter();
        System.Web.UI.HtmlTextWriter htw = new System.Web.UI.HtmlTextWriter(sw);

        
        ListView1.RenderControl(htw);
       

 


       
        string renderedGridView = sw.ToString();
        
        File.WriteAllText(@"D:\new.xls", renderedGridView);
    }