Webdriver MouseMove and Screen Shot

Mouse Move in Wedriver

Actions builder = new Actions(_driver);
builder.MoveToElement(_driver.FindElementByXPath(selector)).Perform();

or

Actions builder = new Actions(_driver);
builder.Click(_driver.FindElementByXPath(selector)).MoveToElement(_driver.FindElementByXPath(selector)).Perform();

Screen Shot

                driver.Navigate().GoToUrl("http://www.baidu.com");
                Screenshot screenShotFile = ((ITakesScreenshot)driver).GetScreenshot();
                screenShotFile.SaveAsFile(@".\baidu.jpg", ImageFormat.Jpeg);