C# objects use from javascript in a HTML based webpage

I am building an Asp Net website in Visual Studio that uses Razor developed HTML pages. I would like to be able to use some C# from the javascript on one of the web pages (this is not creating a plugin that would be displayed in the browser.) I have tried to create a simple Cs class that has a single method that returns a fixed string to test this. The following code is in the ManagedCsClass.cs file is in the App_Code folder in my 开发者_如何学Pythonproject.

[System.Runtime.InteropServices.ComVisibleAttribute(true)]
public class ManagedCsClass
{
    public ManagedCsClass()
    {
        //
        // TODO: Add constructor logic here
        //
    }
    public string ReturnText()
    {
        return "Text from ManagedCsClass";
    }
}

What I am not clear on is where to create the object that would be used by the HTML page (in the same .cs file as the class, another .cs file, or from a call from the HTML browser page).

And what code do I need to use in the javascript to reference the object/method?

Thanks for any help or guidance you can provide. Mark

You are trying to use "ActiveX" com objects, this requires the dll containing that class registered on the client and you will have a lot of security/deploy issues ( the client must trust your object and have the framework installed ). It is not the best way to create a web app today.