How to turn on/off on Raspberry Pi GPIO port 25 by ASP.NET MVC action method.

HomeController.cs

// use TinyGPIO.cs
// https://github.com/sample-by-jsakamoto/SignalR-on-RaspberryPi/blob/master/myapp/TinyGPIO.cs
using myapp;
using System.Web.Mvc;

public class HomeController : Controller
{
    [HttpPut]
    public ActionResult TurnOnLED()
    {
        var gpio25 = TinyGPIO.Export(25);
        gpio25.Direction = GPIODirection.Out;
        gpio25.Value = 1;
    }

    [HttpPut]
    public ActionResult TurnOffLED()
    {
        var gpio25 = TinyGPIO.Export(25);
        gpio25.Direction = GPIODirection.Out;
        gpio25.Value = 0;
    }
}