how to achive data from session

hi

in order.aspx page is button that when click on it it will save data in session:

  protected void Imgorder_Click(object sender, EventArgs e)
    {
        ImageButton ibtn = sender as ImageButton;
        int id = Convert.ToInt32(Request.QueryString["Id"].ToString());
        DataTable dtFiles = GetFilmInfo(id);
        string Name = dtFiles.Rows[0][1].ToString();
        string MKVE = dtFiles.Rows[0][37].ToString();
        string DVDE = dtFiles.Rows[0][38].ToString();
        string PostMkvPr = dtFiles.Rows[0][12].ToString();
        string PostDvdPr = dtFiles.Rows[0][13].ToString();
        string Code = dtFiles.Rows[0][4].ToString();
        string Type = dtFiles.Rows[0][36].ToString();
        string SectionName = dtFiles.Rows[0][3].ToString();
        DataTable dt = new DataTable();
        if (Session["Order"] != null)
        {
            dt = Session["Order"] as DataTable;
        }
        else
        {
            dt.Columns.AddRange(new DataColumn[] { new DataColumn("Id",typeof(int)),new DataColumn("Name",typeof(string)),new DataColumn("Quality",typeof(string)),
                                       new DataColumn("PriceT", typeof(decimal)),  new DataColumn("Price", typeof(decimal)), new DataColumn("Quanyity", typeof(int)),new DataColumn("code",typeof(string)),new DataColumn("Type",typeof(string)),new DataColumn("SectionName",typeof(string)),
                                        new DataColumn("Buy",typeof(string)), });
        }
        dt.Rows.Add(dt.Rows.Count + 1, Name, "MKV", PostDvdPr, PostDvdPr, DVDE, Code, Type, SectionName, "DownLoad");
        int totalOrder = dt.AsEnumerable().Sum(row => row.Field<int>("Quanyity"));
        Lblorder.Text = totalOrder.ToString();
        Session["Order"] = dt;
    }

I have show.aspx page that there are 2 label

LblLink and Lblsend now I want in this page check session[order] Item:Buy

  new DataColumn("Buy",typeof(string)), });

 dt.Rows.Add(dt.Rows.Count + 1, Name, "MKV", PostDvdPr, PostDvdPr, DVDE, Code, Type, SectionName, "DownLoad");

if it was "Download" it do =LblLink.visible=True and Lblsend.Visible=False

How Ican do it?

Best Regards

Neda