>I've got a web app with an Employee page which doubles as both "Add New" or "Edit" edit modes. In my Business Object (BO) I have an EmployeeRules.partial.cs where I have my own custom validation rules that I want to run differently depending on which edit mode I'm in. The web page will have the knowledge as to which edit mode I'm currently in.
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>What global object exists in both places?
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>No, the web Session object doesn't exist in the BO rules object.
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>Nor does the appWeb object exist in the BO rules object.
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>What object/class is available to me for communicating which edit mode I'm currently in so I can run a different set of validation rules?

You could use a hidden field to store the value of edit/add and interrogate that from the business object.