GameObject.Flags = (GameObjectFlags)128;
//or
GameObject.Flags = GameObjectFlags.DontDestroyOnLoad;

 None = 0,

 /// Hide this object in heirachy/inspector
 Hidden = 1,

 /// Don't save this object to disk, or when duplicating
 NotSaved = 2,

 /// Auto created - it's a bone, driven by animation
 Bone = 4,

 /// Auto created - it's an attachment
 Attachment = 8,

 /// There's something wrong with this
 Error = 16,

 /// Loading something
 Loading = 32,

 /// Is in the process of deserializing
 Deserializing = 64,

 /// When loading a new scene, keep this gameobject active
 DontDestroyOnLoad = 128,

 /// Keep local - don't network this object as part of the scene snapshot
 NotNetworked = 256,

 /// In the process of refreshing from the network
 [Obsolete]
 Refreshing = 512,

 /// Stops animation stomping the bone, will use the bone's local position
 ProceduralBone = 1024,

 /// Only exists in the editor. Don't spawn it in game.
 EditorOnly = 2048,

 /// Ignore the parent transform. Basically, position: absolute for gameobjects.
 Absolute = 4096,

 /// The position of this object is controlled by by physics - usually via a RigidBody component
 PhysicsBone = 8192,

 /// Stops this object being interpolated, either via the network system or the physics system
 NoInterpolation = 16384