How to run same script on FF/IE/Chrome in Webdriver

Setting the Browser key in the app.config, we can execute the same script in the different browser(s).

        

         ///

        /// Returns an instance of the web driver based on test browser.

        ///

        /// The browser driver.

        public static IWebDriver GetInstance()

        {

            string browserName = ConfigurationManager.AppSettings["Browser"];

            IWebDriver webDriver = null;

            switch (browserName)

            {

                case Internet_Explorer: webDriver = IEWebDriver(); break;

                case FireFox: webDriver = FireFoxWebDriver(); break;

                case Safari: webDriver = SafariWebDriver(); break;

                case Chrome: webDriver = ChromeWebDriver(); break;

                default: throw new ArgumentException("The suggested browser was not found");

            }

            return webDriver;

        }

         ///

        /// Returns an instance of IE based driver.

        ///

        /// IE based driver.

        private static IWebDriver IEWebDriver()

        {

            IWebDriver webDriver = new InternetExplorerDriver(ieDriverPath, options, TimeSpan.FromMinutes(20));            webDriver.Manage().Timeouts().SetPageLoadTimeout(TimeSpan.FromSeconds(timeOut));

            //Set The Cursor Position Center of the Screen

            Cursor.Position = new Point(Screen.PrimaryScreen.Bounds.Width / 2, Screen.PrimaryScreen.Bounds.Height / 2);

            return webDriver;

        }

        ///

        /// Returns an instance of Firefox based driver.

        ///

        /// FireFox based driver.

        private static IWebDriver FireFoxWebDriver()

        {

            IWebDriver webDriver = new FirefoxDriver();            webDriver.Manage().Timeouts().SetPageLoadTimeout(TimeSpan.FromSeconds(timeOut));

            //Set The Cursor Position Center of the Screen

            Cursor.Position = new Point(Screen.PrimaryScreen.Bounds.Width / 2, Screen.PrimaryScreen.Bounds.Height / 2);

            return webDriver;

        }

        ///

        /// Returns an instance of Safari based driver.

        ///

        /// Safari based driver

        private static IWebDriver SafariWebDriver()

        {

            IWebDriver webDriver = new SafariDriver();            webDriver.Manage().Timeouts().SetPageLoadTimeout(TimeSpan.FromSeconds(timeOut));

            return webDriver;

        }

        ///

        /// Returns an instance of Chrome based driver.

        ///

        /// Chrome based driver.

        private static IWebDriver ChromeWebDriver()

        {

            IWebDriver webDriver = new ChromeDriver(

                (Path.GetDirectoryName(

                System.Reflection.Assembly.GetExecutingAssembly().GetName().CodeBase)

                + "\\..\\..\\..\\..\\ExternalAssemblies").Replace("file:\\", ""));

            return webDriver;

        }

    }

Add browser key in the app.config -

<add key="Browser" value="Internet Explorer" />