So basically, I'm making a Windows Form Application CLR which calculates a worker's wage. Problem is, when I select the schedule (day,night,afternoon,mixed), I use a button for each schedule respectively, which, upon click, calculates everything on the data you've input. While this is effective, I am being asked to use a combo box to demonstrate each schedule, and a single "Calculate" button for this, yet I do not know how to use a combo box correctly, nor how to use the selected option (say, I selected night, and do the respective calculation parameters). I am unable to find a tutorial which might help me, so would anyone mind telling me how do I use the items in the combo box, which would later influence in the calculation? (i.e. if I select 'day', I get 1.5 over my wage for each extra hour, while if my schedule is 'night', it's 2 over my wage).