how to increase session timeout in asp.net?

Question

I tried following codes to increase session timeout, but no use,

code is:

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Answer 1

I wanted to add my final solution. After reading that setting it in the config was "incorrect".

            if (model.RememberMe)
            {
                var ASPCookie = Request.Cookies["ASP.NET_SessionId"];
                ASPCookie.Expires = DateTime.Now.AddDays(15);
                Response.SetCookie(ASPCookie);
            }