Initialize.cs

// NuGet: Selenium.WebDriver.ChromeDriver
using OpenQA.Selenium.Chrome;
IWebDriver driver = new ChromeDriver();
// NuGet: Selenium.Mozilla.Firefox.Webdriver
using OpenQA.Selenium.Firefox;
IWebDriver driver = new FirefoxDriver();
// NuGet: Selenium.WebDriver.PhantomJS
using OpenQA.Selenium.PhantomJS;
IWebDriver driver = new PhantomJSDriver();
// NuGet: Selenium.WebDriver.IEDriver
using OpenQA.Selenium.IE;
IWebDriver driver = new InternetExplorerDriver();
// NuGet: Selenium.WebDriver.EdgeDriver
using OpenQA.Selenium.Edge;
IWebDriver driver = new EdgeDriver();