EventFiringWebDriver ElementValueChanging EventWebDriver
Fires before the driver changes the value of an element via Clear(), SendKeys() or Toggle().

Namespace: OpenQA.Selenium.Support.Events
Assembly: WebDriver.Support (in WebDriver.Support.dll) Version: 2.35.0.0 (2.35.0.0)
Syntax

public event EventHandler<WebElementEventArgs> ElementValueChanging
See Also