Refer to Programming Project 4 in chapter 8 of your textbook. In addition to the requirements of the question, the following should be added:
1 A button to sort, save and redisplay the current directory into name order.
2 A button to exit the program.
3 Full error checking and validation. Try/catch should be used for the handling of the text files.
4 Appropriate use of Sub procedures and Functions (at least one each) with parameter passing.
5 Duplicate names for the listings should not be allowed.
only the code is needed as i have the interface and i can change the names of the objects to match the names you use for the event procedures