Variable to be Public

Question

Hi

  I have below code and i want _driver to be public variable

IWebDriver _driver = new ChromeDriver();

static void Main(string[] args)
        {
            IWebDriver _driver = new ChromeDriver();
            _driver.Navigate().GoToUrl("google.com");
            _driver.FindElement(By.Name("q")).SendKeys("Learn Automation");
        }

Thanks