Open N instances of a URL

OpenChromeSessions.cs

using OpenQA.Selenium;
using OpenQA.Selenium.Chrome;
using System;
using System.Linq;
using System.Threading;

namespace HelloCSharp
{
    class Program
    {
        static IWebDriver OpenUrl(string driverDirectory, string url)
        {
            IWebDriver driver = new ChromeDriver(driverDirectory);
            var navigator = driver.Navigate();
            try
            {
                navigator.GoToUrl(url);
            }
            catch (WebDriverException ex)
            {
                Console.WriteLine($"Failed to load page: {ex.Message}");
            }
            return driver;
        }

        static void DoClick(IWebDriver driver)
        {
            var buttonElement = driver.FindElement(By.Id("foo"));
            buttonElement.Click();
        }

        static void DoClickWithRetries(IWebDriver driver)
        {
            const int numRetries = 5;
            for (int i = 0; i < numRetries; ++i)
            {
                try
                {
                    DoClick(driver);
                    return;
                }
                catch (InvalidElementStateException ex)
                {
                    Thread.Sleep(1000);
                }
            }
        }

        static int Main(string[] args)
        {
            if (args.Length != 3)
            {
                Console.WriteLine("Usage: <exe> <driver_dir> <url> <num_instances>");
                return 1;
            }

            var driverDirectory = args[0];
            var url = args[1];
            var numInstances = int.Parse(args[2]);

            Console.WriteLine($"Opening {numInstances} instances of the URL: {url}");

            Enumerable.Range(0, numInstances)
                .AsParallel()
                .ForAll(x =>
                {
                    Console.WriteLine($"Thread #{x} running...");
                    var driver = OpenUrl(driverDirectory, url);
                    DoClickWithRetries(driver);
                });

            return 0;
        }
    }
}