public void OnNewColour(ColourEventArgs colourArgs)
{
// Note the copy to a local variable, so that we don't risk a
// NullReferenceException if another thread unsubscribes between the test and
// the invocation.
ColourEventHandler handler = NewColour;
if (handler != null)
{
handler(this, colourArgs);
}
}
private void UpdateColour(Color colour)
{
this.SelectedColour = colour;
ColourEventArgs args = new ColourEventArgs(colour);
OnNewColour(args);
this.Refresh();
}