Asp.Net - check/validate cookies support

Here is a code for checking/validating that user device (browser) supports cookies. in other words this code checks if cookies are enabled on the browser.

Here the code implemented in the Login page:

    // Constants:
    protected const string QUERYSTRING_CHECK_COOKIE = "checkcookie";
    protected const string TEST_COOKIE_NAME = "check_cookie";
    protected const string TEST_COOKIE_VALUE = "ok";

    // On-load event, at page load:
    protected override void OnLoad(EventArgs p_eventArgs)
    {
        if (IsPostBack == false)
        {
            // Check if browser support cookies
            if (Request[QUERYSTRING_CHECK_COOKIE] == null)
            {
                // try to insert cookie:
                Response.Cookies.Add(new HttpCookie(TEST_COOKIE_NAME, TEST_COOKIE_VALUE));
                string newUrl = string.Format("Login.aspx?{1}=1", QUERYSTRING_CHECK_COOKIE);
                this.Redirect(newUrl, true);
                return;
            }
            else
            {
                // here, client sould contain test cookie:
                HttpCookie cookie = Request.Cookies[TEST_COOKIE_NAME];
                bool isCookieEnabled = cookie != null && cookie.Value == TEST_COOKIE_VALUE;
                if (isCookieEnabled == false)
                {
                    // cookies are disabled!!! show error message
                    Label1.Text = "Device NOT support Cookies!";
                    return;
                }
            }

        }
    }

You can implement this also in other pages than Login page.
:)