I need a program written which would allow a user to enter two separate numbers and select one of four mathematical operations (add, subtract,...

I need a program written which would allow a user to enter two separate numbers and select one of four mathematical operations (add, subtract, multiply, divide). The answer should be displayed on the same form but separately from the text boxes in which the numbers are entered. The program should have at least two methods that are called from the body of the main program.