The Locate is a instance of the ServiceLocator and is a property inherited from the PageBase class I think.
I don't see what part is in bold but I was able to get the code from the EPiServer 7 CMS Documentation to work by replacing
ContentSearchHandler contentSearchHandler = Locate.ContentSearchHandler();
var serviceLocationHelper = ServiceLocator.Current.GetInstance<ServiceLocationHelper>();
var contentSearchHandler = serviceLocationHelper.ContentSearchHandler();
In addition, instead of locating the ServiceLocationHelper, which is a class that contains common shortcuts to the ServiceLocator, and retrieving the search handler from there, you can fetch the search handler directly from the ServiceLocator:
var contentSearchHandler = ServiceLocator.Current.GetInstance<ContentSearchHandler>();
Great Joel, thanks!
I have copy pasted following code from the EPiServer 7 CMS SDK Documentation: