Where in the code should I reference a business class?

Hi,
Let's say I've created a business object for Employee and I'll be creating generic lists, etc. that use this object. Where in my code should I create a reference to this object so that I can just type the object name to use it as opposed to typing the whole path e.g. List<MyApp.BusinessLayer.CorporateObjects.Employee>? I just want to be able to type List<Employee>.
Currently, I just add a "using" statement up top where I have the other references like System.Web.UI, etc. Is that the proper place to put it?

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