C# で継承されたイベントを適切に発生させるにはどうすればよいですか?

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);
    }
}