How to access output values returned from a Sproc WPF VS2015

Question

Not very good at this I can't seem to be able to interact with the sp in my WPF project I know very little as this is my first time to try and use them so please bare with me.

 

What I have to do is send the sp two values a startDate and endDate which it uses to check for availability of the selected car. It return all the Ids of the cars that are not contained in the Booking tbl on those dates.

 

I want to know how to be able to assign the returned outputs from the sp into a collection so I can display only available cars to the user.