disable a list.add row and change a value of ordered amount

[djpaul]

Hello,
For school i have to make a order program.
But i am struggling with 2 last things.
When someone clicks on a line he can use the nummeric up/down to order a value of that product.
After that he can click on the "add to chart" button and it's added to a txt file.
But when the button is pressed the line or the up/down value has to be disabled.
But i can't figure out how (damn thing!) hihi

There is a txt file from where i fill the listbox. like this:

Private Sub Main_Load(ByVal sender As System.Object, ByVal e As System.EventArg s) Handles MyBase.Load
Try
Dim Text(23, 4) As String
Dim StockList As New StreamReader("w oodsheets.txt")
Do While StockList.Peek <> -1
Dim fileName As String = StockList.ReadL ine
Stock.Items.Add (fileName)
Loop
StockList.Close ()
Catch
MsgBox("Can't find the orderlist.")
End Try
End Sub

I think the problem is starting here, because i think that the txt file has to be putted into a public array, not an variable
Also there is another thing.
In the text file (for example: 3344838; White Oak; 21.85; 0 )
you'll see at the end a 0.
When a amount has been ordered, that 0 has to become the value of the ordered amount...
I hope i explained it well...
If not, i can email you the original program and my source code.

Thanx in advance!

Paul

[vanc]

The first thing is clicking on "a line", I don't know how you handle this, since the line has no event.
The second thing is about your text file. If I don't misunderstand, you want to make orders and write it back to text file. There many ways to do it, but I recommend you should create a class called Order and when you read data from text file, you then create all current Orders object in memory, so it's very easy for you to modify any order, because you have all orders in memory and each order has a object referenced to it. You modify any info in those objects then write it back out.

cheers.