C#에서 상속된 이벤트를 올바르게 발생시키려면 어떻게 해야 합니까?

public event EventHandler Loading;
public event EventHandler Finished;

this.Loading(this, new EventHandler()); // Error: The event 'BaseClass.Loading' can only appear on the left hand side of += or -= 

protected virtual void OnLoading(EventArgs e)
{
    EventHandler handler = Loading;
    if(handler != null)
    {
        handler(this, e);
    }
}

protected virtual void OnFinished(EventArgs e)
{
    EventHandler handler = Finished;
    if(handler != null)
    {
        handler(this, e);
    }
}

public class InheritedClass : BaseClass
{
    public void DoSomeStuff()
    {
        ...
        OnLoading(EventArgs.Empty);
        ...
        OnFinished(EventArgs.Empty);
    }
}