Write a program with

3 buttons

1 textbox

1 maskedtextbox

1 listbox

Button 1: calc how many years between today and 5/1/1850

Button 2: use isonumeric function to make sure textbox1 text is a number and then display its integer part of data in the listbox

Button 3: use the maskedtextbox to force user only input number for cash amount. Then display it in the listbox as currency