CefSettingsPersistSessionCookies Property

To persist session cookies (cookies without an expiry date or validity interval) by default when using the global cookie manager set this value to true. Session cookies are generally intended to be transient and most Web browsers do not persist them. A |cache_path| value must also be specified to enable this feature. Also configurable using the "persist-session-cookies" command-line switch. Can be overridden for individual CefRequestContext instances via the CefRequestContextSettings.persist_session_cookies value.

public bool PersistSessionCookies { get; set; }