I have several questions related to an exercise where there are two text boxes where a user enters a number in each and clicks on a command button to sum all the numbers in between including the two entered then which places the result in a label box.

1) How do I code to perform the summation when the user presses the enter key in either text box?

2) How do I display the result in red for negative numbers and black for zero or positive numbers?

3) How do I restrict the application to handle entries from -32768 thru 32767 referring to these constants using constant identifiers (e.g. MIN_VALUE and MAX_VALUE) and also restirct the user to enter no more than 6 characters?

4) How do I make the summation work if the first value entered is more than the second (I.e. sum from the second value to the first)?

Thanks for any help.