CSc 050
Assignment 7 - Visual Basic Part II
Due Mon, Oct. 31, 2005


Now that your interface is complete, it is time to make some of the buttons actually work. In class, you learned how to use the assignment operator (=) to change the state of control elements on your form. A computer instruction that uses the assignment operator is called an assignment statement. You also learned how to invoke some built-in operations called methods and how to create dialogue boxes. The one-line summary of this assignment is: Get everything working that only requires assignment statements, methods, and dialogue boxes to do their function. Since everyone's interface will be slightly different (because you had a choice of what control elements to use), that means everyone will have a different amount of work to do for this assignment. Someone who needs to get many control elements working this week will probably have a lighter load in the next assignment, and vice versa. Here are the details.

Part 1: Fix your design (3 pts.)
If you had any flaws in your interface from last assignment (you'll get it back on Wed, 10/26), be sure to fix those. You can still progress with some code writing (in the Clear all button for example) in the meantime. As always, you will lose points again for any design problems that remain unfixed.

Part 2: Practice with dialogue boxes (4 pts.)
You don't have enough of the VB language yet to make the Play and Make purchases buttons work correctly. So in the meantime, make each of them pop up a dialogue box that says something to that effect ("this will work soon!"). Both dialogue boxes should have a title. At least one should have an icon.

Part 3: Make the Clear button work (5 pts.)
The Clear all button should return the form to its initial state (i.e. when the user first sees it). All option and checkbox buttons should be turned off, all text fields (except those that give instructions for the user) should be cleared, the ListBox that acts as the Playlist should be cleared, and all PictureBoxes should be cleared. If you have added other control elements that are not part of the minimum, you should return those to their initial state too. Be sure to test this thoroughly. For example, if you currently have an empty PictureBox (because a user action will fill it with something later), then temporarily put a default picture into it using the "Picture" property in the Property List. That way you can make sure a filled PictureBox is actually getting cleared. You can remove the default picture after your tests succeed. Do the same trick with other control elements if necessary.

Part 4: Make the Artist selection control elements work -- for some of you (3 pts.)
If you used option buttons for your artists, get these to work. In my demo, for example, each option button fills a PictureBox with a picture, puts appropriate songs in the PlayList ListBox, and puts a description of the artist in a text field. If you used a menu (like a ComboBox) or dialogue boxes for your artist selection, you can't make this work yet. You'll make it work in the next assignment.

Finally, if you had other control elements besides the minimum that you can get to work with just assignment statements, dialogue boxes, and methods, get those to work too. An example is an Instructions Command button that simply pops up a dialogue box with user instructions. If you have something "extra" that you are not sure if you can get to work yet, come ask me!

What to turn in

Turn in an electronic copy of your VB project on Blackboard and a copy of your code on paper. Remember, a VB project is made up of a bunch of files! Keep them all together in a single folder named with your name before zipping the folder. If you are still having trouble using zip on folders, come see me!

Administrative statement

Homeworks are individual projects. I encourage you to talk to others about the general nature of the homework and ideas about how to pursue it. However, the technical work, the writing, and the inspiration behind these must be substantially your own. If any person besides you contributes in any way to the project, you must credit their work on your homework. Similarly, if you include information that you have gleaned from other published sources, you must cite them as references. Looking at, and/or copying, other people's homework or written work is inappropriate and will be considered cheating.
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