title: C# - Equivalent to java's ExpectedConditions.not
body: <p>I'm writing some automated tests using Selenium in C# and I need to wait until a certain element is not in a Stale state. In java, I've once used something like <code>ExpectedConditions.not(ExpectedConditions.stalenessOf(element)</code>,
  but I haven't yet found a way to do this in C#. </p>
  
  <p>Is there a workaround for this problem or does Selenium in .NET not have the "Not" property at all?</p>