In trying Inputbox, I checked the box associated with Microsoft JScript in the .NET framework under .NET References (Editor tab), but the code does not compile. Any comment?

No wonder it doesn't compile. "Microsoft JScript" doesn't have to do with Inputbox() - add a reference to Microsoft.VisualBasic instead. The correct name of this function is InputBox (in C# case matters) and it resides in Microsoft.VisualBasic namespace. Code below shows how to use it but read on:

CODE:
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However, I'd recommend installing Community Components, restarting WLP, and simply using Input. This wrapper method is an easier alternative that doesn't require adding a reference. And thanks to extension methods, even a "using Community.Components;" isn't required. Check it out:

Wealth-Lab Wiki > Input

Eugene:
Thank you for your detailed instructions. Without your answer, I would not know the power and convenient of the Community Component.

You're welcome.

By the way, the 4th line under Parameter Description of Wealth-Lab Wiki > Input should be
(optional) VPos Distance in pixels of the upper edge of the dialog box from the top of the screen.

Thanks for the heads-up. Fixed.