How do I set cookie expiration to "session" in C#?

Question

Self-Explanatory. In PHP, the solution would be to set the cookie expiration to 0; I'm unsure about C# since it requires a DateTime value.

Answer 1

The docs for Cookie.Expires call it right out.

Setting the Expires property to MinValue makes this a session Cookie, which is its default value.

cookie.Expires = DateTime.MinValue

Answer 2

Do you mean any cookie or the session cookie? ASP.NET uses cookie by default for session 'management'.

Either you have the expiry or timeout in the web.config file, or programmatically set it using:
Session.Timeout = [x]; \\where [x] is in minutes

This can be called in different ways depending on your needs.