Output-of-last-closing-price-for-signals

QUOTE:
Is it possible to display the last closing price of the underlying share when the signal is issued?

The signal typically applies to the next (or forthcoming, off-the-Chart) bar, so are you asking to display the closing price of the previous (or last Chart) bar?

You can just mouse over the previous (last Chart) bar to get its Closing price you know. Is there something special you want to do in code with that last-bar Closing price? Have you tried to activate the "Data Panel" from the View menu to see the different indicator values (such as the Closing price of a particular bar)?

Now both the streaming Chart and the streaming Quotes window display the "current" price. The Quotes window also shows the price change (in both dollars and percent change) from the previous Close to the current price.

QUOTE:
Can this be programmed in C#?

For non-trading Chart display stuff, you'll probably need to use code. But I think what you want can be displayed in the Data Panel.