c# - How to call custom event

1) Custom event without parameters:

public Action OnBeforeEvaluationEvent;
...
if ( OnBeforeEvaluationEvent != null ) OnBeforeEvaluationEvent();

2) Custom event with parameter(s):

public delegate void OnAfterEvaluatingDelegate( CodeConditionGroup _conditionGroup );    
public event OnAfterEvaluatingDelegate OnAfterEvaluationgEvent;

if ( OnAfterEvaluationgEvent != null ) OnAfterEvaluationgEvent( condition );