title: Selenium OpenQA.Selenium.DriverServiceNotFoundException in FireFox
body: <p>I'm trying to get started writing Selenium tests, and the first very basic test I write fails with the exception <code>OpenQA.Selenium.DriverServiceNotFoundException</code>.</p>
  
  <pre><code>using OpenQA.Selenium;
  using OpenQA.Selenium.Firefox;
  
  namespace WebDriverDemo
  {
          class Program
      {
          static void Main(string[] args)
          {
              IWebDriver driver = new FirefoxDriver();
              driver.Url = "http://www.google.com";
  
          }
      }
  }
  </code></pre>
  
  <p>The debugger says I need to download geckodriver.exe and set it up on my PATH variable, which I've done, and I still get the same exception. When I do the same thing with a <code>ChromeDriver</code>, it works fine.</p>
  
  <p>Also, according to the <a href="https://developer.mozilla.org/en-US/docs/Mozilla/QA/Marionette/WebDriver" rel="nofollow noreferrer">MDN</a>, if I'm using Selenium 3.0 or later, it should be enabled by default. I'm using Selenium 3.0.1 on a Windows 10 computer.</p>