Question

Can I simply use delegate even though it may not be required?

Answer 1

When calling Control.Invoke, you don’t need to check InvokeRequired, it checks it for you.

Control.BeginInvoke from the same thread is useful at times, it puts the call on the end of the message queue instead of making it immediately.

It’s really not clear enough what you’re doing to give specific advice.

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Looking at your sample code, this is all you need:

WirelessGreenLight.Invoke(new MethodInvoker(redGreenLight));

or, if you can’t change the caller:

public void redGreenLight()
{
    WirelessGreenLight.Invoke(new MethodInvoker(redGreenLightImpl));
}

private void redGreenLightImpl()
{
    // real work done here
}