[ASK} Newbie question. How to get value from two Dropdown list and Check it with IF?

Sorry I am new in Unity and C#, so maybe this question is very beginner.

1. I want to get value from 2 DropDown like the image I've upload (each DropDown contains value "a" and "b")
2. For example :DropDownLeft text = a, DropDownRight text = b, then "not match", but "a" and "a" or "b" and "b" then "match" message will appear.

Is there any simple tutorial I can read that similar?

Thanks in advanced!

wn