Asserting a text does not exist on the page iOS and C#

I am trying to ensure the message undo does not populate in the XPath.
I am using Boolean exist = _IOSdriver.FindElementsByXPath(("//XCUIElementTypeButton[@name=‘Undo’]")).Count() < 0;
The problem is no matter what I change the test passes I can change it to > I can change the count to 1 or 100 or instead of <> I can use == still it will pass without fail. I am making it fail and still it seems to pass. Is there a better assertion or something other than count I should be using in C#?