FOR TO NEXT - LOOP Question

[huertj]

Hello, does anyone know if this is a bug or if I’m doing it wrong. I’m basically I’m using two For loops to filter out items from one list if they already exits on another (for dual list control). But when I remove a item from the list and I decrement the variable it looks like it does not decrement in memory therefore the inner loop will always read 23 even though I decrement the variable Sourcecounter. SO if outer loop has 2 items and inner loop has 23 and a item matches then I decrement the initial length of the inner loop by SourceLenght - 1. But the variable Sourcecounter will always go to 23 not 22. Here is the sample Dim DestinationLenght As Integer = 2 Dim SourceLenght As Integer = 23 Dim Destinationcounter As Integer For Destinationcounter = 0 To DestinationLenght Dim Sourcecounter As Integer For Sourcecounter = 0 To SourceLenght If Me.lstSource.Items(Sourcecounter).Text.ToString = Me.lstDestination.Items(Destinationcounter).Text.ToString Then Me.lstSource.Items.RemoveAt(Sourcecounter) Sourcecounter = Sourcecounter - 1 SourceLenght = SourceLenght - 1 End If Next Next Thanks

[Guffa]

The expressions in the For statement is calculated once when the loop is started, not every iteration. --- b { font-weight: normal; }

[arcticbrew]

your concept will work if you use a while loop for the inner loop. Sourcecounter = 0 Sourcelength = 23 While Sourcecounter < Sourcelength Sourcecounter +=1 If <condition> then <do removal> Sourcecounter -= 1 Sourcelength -= 1 End If End While

[huertj]

Thanks