When to use Request.Cookies over Response.Cookies?

Question

Do I use response when at a page event (e.g. load) as this is a response from ASP.NET, and request when pressing a button as this is a response going to ASP.NET for processi

Answer 1

When writing a cookie, use Response but reading may depend on your situation. Normally, you read from Request but if your application is attempting to get a cookie that has just been written or updated and the round trip to the browser has not occured, you may need to read it form Response.

I have been using this pattern for a while and it works well for me.

public void WriteCookie(string name, string value)
{
    var cookie = new HttpCookie(name, value);
    HttpContext.Current.Response.Cookies.Set(cookie);
}


public string ReadCookie(string name)
{
    if (HttpContext.Current.Response.Cookies.AllKeys.Contains(name))
    {
        var cookie = HttpContext.Current.Response.Cookies[name];
        return cookie.Value;
    }

    if (HttpContext.Current.Request.Cookies.AllKeys.Contains(name))
    {
        var cookie = HttpContext.Current.Request.Cookies[name];
        return cookie.Value;
    }

    return null;
}