Inside of my Windows Form Application , I have a textbox that the user can enter numbers into. I also have an add button if they would like to enter a number and then add another they can hit the button. I'm having trouble with figuring out what you can use if you want to save the first number entered, and then the next and so on. I want to be able to use all of the numbers in calculations later but I'm not sure how to save each number they enter. Do anyone have any suggestions?