MVC Example calling async business method

Can anyone point me to an example of calling an asynchronous method on a business object from a controller in ASP.Net MVC 5?   Or just show me what the call would be and how the business object method is done.

Currently confused looking at the examples in ProjectTracker, and wondering if GetProjectList<EventHandler<DataPortalResult<ProjectList>> callback) is what I need.

Thanks,
Richard.