IWebDriver driver;
driver = new ChromeDriver();
driver.Url = "https://upbit.com/exchange?";
driver.FindElement(By.CssSelector("table>tbody>tr>td:nth-child(6)>a")).Click(); //table>tbody>tr>td:nth-child(6)>a -> cancel button(hide element)

try
{
IWebDriver driver;
 driver = new ChromeDriver();
 driver.Url = "https://upbit.com/exchange?";
 driver.FindElement(By.CssSelector("table>tbody>tr>td:nth-child(6)>a")).Click(); //table>tbody>tr>td:nth-child(6)>a -> cancel button(hide element)
}
catch
{
}