Unable to get CSS Selector "nth-type" working with WebDriver

Though have been able to use simple CSS (just including id, name) but "nth-type" gives up.

Here is the test method -

public static String GetTextByCSSSelector(IWebDriver webDriver, String cssLocator)
    {
        return we开发者_高级运维bDriver.FindElement(By.CssSelector(cssLocator)).Text;
    }

and this is the method call -

GetTextByCSSSelector(_webDriver, "css=div#filelist div:nth-child(1)");

and this is the exception -

OpenQA.Selenium.WebDriverException : An invalid or illegal string was specified

I used the locator mentioned above in Selenium IDE and it does highlight the element. Any guess?

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Try div:first-child.

If that works it would imply that you only have CSS2 ability, not CSS3 ability.

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Remove css= from selector, and enjoy :)