Save multiple CheckBox selected values in Cookies using C# in ASP.Net

Hi nedash,

I have created sample that full-fill your requirement.

HTML

<div>
    <asp:CheckBox ID="cb1" Text="Test1" runat="server" />
    <br />
    <asp:CheckBox ID="cb2" Text="Test2" runat="server" />
    <br />
    <asp:CheckBox ID="cb3" Text="Test3" runat="server" />
    <br />
    <asp:Button Text="Save" runat="server" ID="btnSave" OnClick="Imgorder_Click" />
    <br />
    Saved Cookie Value:&nbsp;<asp:Label runat="server" ID="lblCookie" />
</div>

Code

protected void Imgorder_Click(object sender, EventArgs e)
{
    HttpCookie order = new HttpCookie("order");
    string checkedValue = string.Empty;
    if (cb1.Checked)
    {
        checkedValue += cb1.Text + ",";
    }
    if (cb2.Checked)
    {
        checkedValue += cb2.Text + ",";
    }
    if (cb3.Checked)
    {
        checkedValue += cb3.Text + ",";
    }
    order.Value = checkedValue.Remove(checkedValue.Length - 1);
    order.Expires = DateTime.Now.AddDays(1d);
    Response.Cookies.Add(order);
    lblCookie.Text = Response.Cookies["order"].Value;
}

Screenshot