IWebElement table = driver.FindElement(By.XPath("//*[@id='sandbox-
                 container1']/div/input"));

        table.Click();

        IWebElement el = driver.FindElement(By.XPath("/html/body/div[3]/div[1]"));

        List<IWebElement> rowEl = new List<IWebElement>(el.FindElements(By.TagName("tr")));

        List<IWebElement> colEl = new List<IWebElement>(el.FindElements(By.TagName("td")));

                foreach (IWebElement cols in colEl)
                       {
                      if (cols.Text.Equals("5"))
            cols.Click();}