Nullability of reference types in type of parameter 'sender' of 'void ImageClassification.UserControl_HandleDestroyed(object sender, EventArgs e)' doesn't match the target delegate 'EventHandler' (possibly because of nullability attributes).

Non-nullable field 'videoDevices' must contain a non-null value when exiting constructor. Consider declaring the field as nullable.

Non-nullable field 'videoSource' must contain a non-null value when exiting constructor. Consider declaring the field as nullable.

Non-nullable field 'TestmlContext' must contain a non-null value when exiting constructor. Consider declaring the field as nullable.

Non-nullable field 'TestpredictionEngine' must contain a non-null value when exiting constructor. Consider declaring the field as nullable.

Non-nullable event 'UserControlClosed' must contain a non-null value when exiting constructor. Consider declaring the event as nullable.

Nullability of reference types in type of parameter 'sender' of 'void Create.OnClosing(object sender, CancelEventArgs cancelEventArgs)' doesn't match the target delegate 'CancelEventHandler' (possibly because of nullability attributes).

Converting null literal or possible null value to non-nullable type.

Converting null literal or possible null value to non-nullable type.