How can I take a screenshot with Selenium WebDriver?

Question

Is it possible to take a screenshot using Selenium WebDriver?

(Note: Not Selenium Remote Control)

Answer 1

C# (Ranorex API)

public static void ClickButton()
{
    try
    {
        // code
    }
    catch (Exception e)
    {
        TestReport.Setup(ReportLevel.Debug, "myReport.rxlog", true);
        Report.Screenshot();
        throw (e);
    }
}