Data Controls :: Use Cookies To Store Data From Database

I have OrderFilm.aspx that bind films information from database and I want use cookie in this page and users can order their film with different quality:

this is table:

Id Name 720P 1080P 720Price 1080Price

1 Spectre.2015 1 1 200$ 300$
2 Water Fall 1 1 150$ 200$

Orderfilm.aspx

<asp:DataList ID="DataList1" runat="server" RepeatColumns="2" RepeatDirection="Horizontal">
<ItemTemplate>
<div>
<asp:Label ID="lbldes" runat="server" Text='<%# Eval("name") %>'></asp:Label>
<asp:HyperLink ID="HyperLink3" runat="server" CssClass="LBP3In" NavigateUrl='<%#"film.aspx?ID="+Eval("ID")%>'

[Code] ....

In orderfilm.aspx users click on Film name and after that they go to film.aspx page that bind other film information from database :

film.aspx:

<div>
<asp:Label ID="lblMessage" runat="server" />
<div>
<asp:Label ID="Lblname" runat="server" />
</br>
<asp:CheckBox ID="cb720P" runat="server" Text="720P " />

[Code] ....

here users can select their intendend quality from checkbox:

film.aspx.cs:

string Film720p = string.Empty;
string FilmName = string.Empty;
string Film1080p = string.Empty;
protected void Page_Load(object sender, EventArgs e) {
viewproduct();
lblMessage.Text = GetCookies();

[Code] ...

Here I save cookie like this:

FilmName=Request.Cookies["orderFilm"]["FilmName"];
Film720p = Request.Cookies["orderFilm"]["Film720p"];
Film1080p = Request.Cookies["orderFilm"]["Film1080p"];

I want if users click on film name from orderfim.aspx ( i.e:Spectre.2015 )and go to film.aspx and select 720P checkbox it save in cookie that users select 720P for  Spectre.2015 ...

here I wrote:

HttpCookie cookie = new HttpCookie("orderFilm");
if (cb720P.Checked) {
cookie["Film720p"] = cb720P.Text;
} if (cb1080P.Checked) {
cookie["Film1080P"] = cb1080P.Text;
} cookie["FilmName"] = Lblname.Text;
Response.Cookies.Add(cookie);
lblMessage.Text = GetCookies();

but  problem is that in orderfilm.aspx page if users click in other film name(i.e:WaterFalll) and go to Film.aspx page and checked 720p checkbox It delete their last selected cookie and just set their new cookie:

and attention that here I use querystring in orderfilm.aspx:

<asp:HyperLink ID="HyperLink3" runat="server" CssClass="LBP3In" NavigateUrl='<%#"film.aspx?ID="+Eval("ID")%>'
Target="_blank">click to order</asp:HyperLink>