AdvancedElementOperations.cs

// Drag and Drop
IWebElement element = 
driver.FindElement(By.XPath("//*[@id='project']/p[1]/div/div[2]"));
Actions move = new Actions(driver);
move.DragAndDropToOffset(element, 30, 0).Perform();
// How to check if an element is visible
Assert.IsTrue(driver.FindElement(By.XPath("//*[@id='tve_editor']/div")).Displayed);
// Upload a file
IWebElement element = driver.FindElement(By.Id("RadUpload1file0"));
String filePath = @"D:\WebDriver.Series.Tests\\WebDriver.xml";
element.SendKeys(filePath);
// Scroll focus to control
IWebElement link = driver.FindElement(By.PartialLinkText("Previous post"));
string js = string.Format("window.scroll(0, {0});", link.Location.Y);
((IJavaScriptExecutor)driver).ExecuteScript(js);
link.Click();
// Taking an element screenshot
IWebElement element = driver.FindElement(By.XPath("//*[@id='tve_editor']/div"));
var cropArea = new Rectangle(element.Location, element.Size);
var bitmap = bmpScreen.Clone(cropArea, bmpScreen.PixelFormat);
bitmap.Save(fileName);
// Focus on a control
IWebElement link = driver.FindElement(By.PartialLinkText("Previous post"));
// Wait for visibility of an element
WebDriverWait wait = new WebDriverWait(driver, TimeSpan.FromSeconds(30));
wait.Until(ExpectedConditions.VisibilityOfAllElementsLocatedBy(
By.XPath("//*[@id='tve_editor']/div[2]/div[2]/div/div")));