public void DeselectAllIWebElementTest()
{
var elementActions = new ElementActions(Driver);
Driver.Url = "http://automate-apps.com/select-multiple-options-from-a-drop-down-list/";
elementActions.SelectDropdownValueByText(By.XPath("//select[@name='cars']"), "Honda");
elementActions.SelectDropdownValueByText(By.XPath("//select[@name='cars']"), "BMW");
Assert.IsTrue(elementActions.GetAllSelectedOptions(By.XPath("//select[@name='cars']")).Count == 2, "The total selected dropdown options wasn't 2.");
elementActions.DeselectAll(Driver.FindElement(By.XPath("//select[@name='cars']")));
Assert.IsTrue(elementActions.GetAllSelectedOptions(By.XPath("//select[@name='cars']")).Count == 0, "The total selected dropdown options wasn't 0.");
}