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Hey guys i get this error when i try to assign CartID to a string. Would really appreciate any help. Thanks

private static string CartID
{
    get
    {
        HttpContext cont = HttpContext.Current;
        string id = cont.Request.Cookies["ShopCartID"].Value;

        if (cont.Request.Cookies["ShopCartID"] != null)
        {
            return id;
        }
        else
        {
            id = Guid.NewGuid().ToString();
            HttpCookie cookie = new HttpCookie("ShopCartID", id);
            int days = 7;
            DateTime currentDate = DateTime.Now;
            TimeSpan timeSpan = new TimeSpan(days, 0, 0, 0);
            DateTime expiration = currentDate.Add(timeSpan);
            cookie.Expires = expiration;
            cont.Response.Cookies.Add(cookie);
            return id.ToString();
        }
    }
}
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2 Answers

up vote 0 down vote accepted

There is no CartID in your question (other than the class itself) so I will assume you mean ShopCartID.

cont.Request.Cookies["ShopCartID"] could return null if a cookie with that name doesn't exist. You can't call members (in this case, Value) on a null reference. You have to first check if the cookie is null:

HttpCookie cookie = cont.Request.Cookies["ShopCartID"];
string id = cookie != null ? cookie.Value : null;
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up vote 0 down vote

Try putting your null check before accessing the cookie value. Currently, your code calls cont.Request.Cookies["ShopCartID"].Value, which will fail if the cookie isn't there.

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