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 # Appendix D: Using OpenTD Interactively with the CInteractive Compiler

 Last update: 08.05.2025 

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Normally C# is compiled before running, but you can open an interactive C# Read-eval-print loop (REPL) in Visual Studio using the following command: View->Other Windows->C# Interactive

Once open, you can use it to interactively execute C# code, including OpenTD. For example:

```csharp
> \#r "OpenTD" // loads the dll as a reference
> using OpenTD;
> var td = new ThermalDesktop();
> td.Connect();
> var n = td.CreateNode(new Point3d(1, 1, 3));
> td.ZoomExtents();
> n.Comment = "Hello World!";
> n.Update();
> var nTest = td.GetNodes().First();
> Console.WriteLine(nTest);
RcNode.MAIN.1::236 "Hello World!"
> td.Quit();

```