Funny, today after years I thought to finally use Cookies in one of my project. It is probably my first attempt to use Cookie in ASP.NET in last 5 yrs. WOW, that is amazing. Anyways, I just notice one thing and thought it might help any first timer, so here is the key note I want to share. In ASP.NET if you want to read Cookie, use REQUEST.Cookies, but if you want to add new Cookie use RESPONSE.Cookies. This is very minor difference and I really waste 30 minutes before I release I was using Request.Cookies to add new cookie, but it won’t get added that way.