using Microsoft.VisualBasic;
Microsoft.VisualBasic.Interaction.InputBox(\"Favourite RPG?\", \"Game\", \"Cool!\");
So what this does is basically a
You need to add a reference to the Microsoft.VisualBasic.dll
The using statement you have is not a reference. It's merely a shortcut so you don't have to type the full namespace every time you want to access a member inside it.
In addition to using Microsoft.VisualBasic;
add the reference, too. Here's a visual answer:
Then
Right click your References
in the Solution Explorer
click Add Reference
,then search for Microsoft.VisualBasic
and add it to your references.
For more information see this documentation: How to: Add or Remove References By Using the Add Reference Dialog Box