CODE EXAMPLE FOR CSHARP

photon

public override void OnJoinRandomFailed(short returnCode, string message)
{
    Debug.Log("PUN Basics Tutorial/Launcher:OnJoinRandomFailed() was called by PUN. No random room available, so we create one.
Calling: PhotonNetwork.CreateRoom");

    // #Critical: we failed to join a random room, maybe none exists or they are all full. No worries, we create a new room.
    PhotonNetwork.CreateRoom(null, new RoomOptions());
}

public override void OnJoinedRoom()
{
    Debug.Log("PUN Basics Tutorial/Launcher: OnJoinedRoom() called by PUN. Now this client is in a room.");
}