Using javascript for custom purposes

This shows the two-way interaction between Javascript and c#.

1. Javascript calls a c# method
2. C# gets the result of an expression in Javascript

-

Type scriptType = Type.GetTypeFromCLSID(Guid.Parse("0E59F1D5-1FBE-11D0-8FF2-00A0D10038BC"));

dynamic obj = Activator.CreateInstance(scriptType, false);
obj.Language = "javascript";
obj.AddObject("MyClass",new JSAccessibleClass());

obj.Eval("MyClass.MsgBox('Hello World')"); //<--1
var result = obj.Eval("3+5"); //<--2


[ComVisible(true)]
public class JSAccessibleClass
{
    public void MsgBox(string s)
    {
        MessageBox.Show(s);
    }
}

There are many standalone implementations of JavaScript that you may be able to leverage for this purpose:

Here is a link to the stackoverflow info page on JavaScript which lists at the top many of these implementations: https://stackoverflow.com/tags/javascript/info

While it is possible to use JavaScript as scripting for .Net application it is not most popular choice. If you can pick other language - IronPython or LUA.Net may be choices you'll get better support. I listed several links in similar question recently: Write npc scripts to be executed by c# using class with npc methods.

Otherwise JavaScript.Net (part of .Net framework) or other implementations either explicitly .Net or with .Net bindings will work as scripting language.