Pass CheckBoxList Selected Items to another page in ASP.Net

Refer this code

HTML

<form id="form1" runat="server">
<div>
    <asp:DropDownList ID="ddlCategory" runat="server">
        <asp:ListItem Text="Please Select" Value="Please Select" />
        <asp:ListItem Text="Mobile" Value="Mobile" />
        <asp:ListItem Text="Home Appliances" Value="Home Appliances" />
        <asp:ListItem Text="TV" Value="TV" />
    </asp:DropDownList>
    <hr />
    <asp:CheckBoxList ID="chkProduct" runat="server">
        <asp:ListItem Text="Please Select" Value="Please Select" />
        <asp:ListItem Text="Samsung" Value="Samsung" />
        <asp:ListItem Text="LG" Value="LG" />
    </asp:CheckBoxList>
    <br />
    <asp:Button Text="Redirect to get more Info" OnClick="Redirect" runat="server" />
</div>
</form>

C#

protected void Page_Load(object sender, EventArgs e)
{
    if (!this.IsPostBack)
    {
        if (Session["Category"] != null)
        {
            this.ddlCategory.Items.FindByValue(Session["Category"].ToString()).Selected = true;
        }
        if (Session["Products"] != null)
        {
            string[] list = (string[])Session["Products"];
            foreach (string s in list)
            {
                this.chkProduct.Items.FindByValue(s).Selected = true;
            }
        }
    }
}

protected void Redirect(object sender, EventArgs e)
{
    string category = this.ddlCategory.SelectedItem.Value;
    Session["Category"] = category;
    string selected = string.Empty;
    foreach (ListItem item in this.chkProduct.Items)
    {
        if (item.Selected)
        {
            selected = selected + item.Value + ",";
        }


    }
    string[] products = selected.Remove(selected.Length - 1).Split(',');
    Session["Products"] = products;
    Response.Redirect("Default2.aspx");
}

Second Page

<div>
This is a second page
    <hr />
    <asp:Button Text="Back to List" OnClick="BackToList" runat="server" />
</div>

 C#

protected void BackToList(object sender, EventArgs e)
{
    Response.Redirect("Default.aspx");
}