Код:

public static void Main(string[] args)
        {
            IWebDriver driver = new ChromeDriver();
            driver.Navigate().GoToUrl("http://.....");
            driver.Navigate().Refresh();
            driver.FindElement(By.Id("LoginUsername")).SendKeys("User");
            driver.FindElement(By.Id("LoginPassword")).SendKeys("Pass");
            driver.FindElement(By.Id("loginBtn")).Click();
            driver.SwitchTo().Frame(0);

            List<IWebElement> table = new List<IWebElement>(driver.FindElements(By.XPath("//*[contains(@class,'x-grid3-row-table')]")));
            //List<IWebElement> tableTr = new List<IWebElement>(table.FindElements(By.TagName("tr")));

            foreach (IWebElement row in table)
            {

                ReadOnlyCollection<IWebElement> cells = row.FindElements(By.TagName("td"));
                Console.WriteLine("\t" + row.Text);
            }
        }