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true if the session identifier is valid; otherwise, false.
The ISessionIDManager.Validate(string) method verifies that the supplied id is a valid session identifier.
Your System.Web.SessionState.ISessionIDManager implementation should call the ISessionIDManager.Validate(string) method from the ISessionIDManager.GetSessionID(System.Web.HttpContext) method when retrieving a session identifier from an HTTP request to ensure that the supplied session identifier is properly formatted.