C# Selenium webdriver Java script with webdriver

driver.Navigate().GoToUrl("http://www.google.com");

            var title = ((IJavaScriptExecutor)driver).ExecuteScript("return document.title");

            System.Console.WriteLine("Title of the window : " + title);

            var js = (IJavaScriptExecutor)driver;

            var length = js.ExecuteScript("var links = document.getElementsByTagName('A'); return links.length");

            System.Console.WriteLine("Length of Element : " + length);