This opaque class encapsulates the state of an ActiveX control in persistence scenarios. You can retrieve the state using the AxHost.OcxState property, although more normally it would be read from or written to a stream.

public class AxHost.State : System.Runtime.Serialization.ISerializable {
// Public Constructors
   public AxHost.State(System.IO.Stream ms, int storageType, bool manualUpdate, string licKey);
}