DaniWeb IT Discussion Community - Looking for List Box help, please!

Hi All,

First time poster, so please go easy on me!

I am taking a VB.net class at Cleveland State and I have run into some trouble. I am working on a project that requires the user to input test scores via a text box and button into a list box, minimum possible score on a test (via input box, most likley, if I ever get to that part!), maximum possible score on a test, allow the user to modify or delete these scores at a later date, and then perform calculations returning the mean, variance, standard deviation, high score, low score, and score range.

I can get the calculations just fine, display the information after it is calculated..these parts are very simple to me, however I am running into one major snag before I can even go into calculations and the like...I can't for the life of me figure out how to, first, edit a number that has already been entered into a list box. I can take the number out of the box and place it back into a text box, but I can't get the code (simple as it may be) to replace that number. Second, I can't figure out how to use the contents of the list box in calculations. How do I go about gathering up all the information entered into the list box (test score, test minimum grade, test maximum grade) and put them into useable forms so that I can get my mean and class score.

My interface layout is like this:

I have a text box to enter your score followed by three buttons: Add Score, Edit Score, Delete Score. Under that is a list box where the scores are to be stored. I plan on displaying the calculations each in a seperate text box preceded by its appropriate title in a label, which would be displayed after clicking another button, Calculate.

I can provide what code I have done to anyone who may be willing to give me some tips. I am not asking for you to do this program for me, just looking for a couple lines of code that I can't seem to figure out!!

Thanks in advance for your help!

Don