In order to have a program close use:
A) the reserved word exit
B) the reserved word unload
C) Application.Exit()
D) Application.Unload()

Question

Quizplus · Accepted Answer

The recommended way to close a program in C# is by calling the static method Application.Exit(). This method terminates all running message loops and closes all windows associated with the application. It also raises the Closing event for each form, giving developers an opportunity to cancel the exit operation if necessary. Using the reserved word exit or unload may have unintended consequences or cause issues with memory leaks.

In Order to Have a Program Close Use