Help with ListBox editing - [2002 / 2003]

[Currymunch14]

Hey first time poster so be gentle >_<

Writing an app that needs to read a value off a list box then update that value dynamically.

so i figured write an add / subtract function for the first step

Function increase(ByVal i As Integer, ByVal j As Integer) As Integer
increase = i + j
End Function

Function decrease(ByVal i As Integer, ByVal j As Integer) As Integer
decrease = i - j
Function

Then I get owned by being a novice when it comes to listboxes and arrays -- only being doing this for a couple of days now

I tried

Private Sub RemBal_Click(ByVal sender As System.Object, ByVal e As _ System.EventArgs) Handles RemBal.Click

increase(CInt(Balance.SelectedIndex), CInt(TextBox1.Text))
End Sub

It Aims to read the value from highlighted part (the selected value)of a listBox called Balance then increase the value using the function above by a value that is put in a text box called TextBox1.

Really just need help with selecting the value in a listbox and editing it

Didn't really do much and was wondering if anyone could point me in the right direction. Thanks a bunch in advance