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If the System.Web.Security.FormsAuthenticationTicket is created using the FormsAuthenticationTicket.#ctor(string, bool, int) constructor that does not supply a parameter for an expiration date and time, the FormsAuthenticationTicket.Expiration property returns a value based on the current local date and time plus the value of the timeout parameter supplied to the constructor.
If the System.Web.Security.FormsAuthenticationTicket was created using a constructor that takes an expiration parameter, the FormsAuthenticationTicket.Expiration property returns the value supplied to the expiration parameter.