This is free .NET code that converts the contents of an ArrayList to a comma delimited string, or any other character delimited string

    Dim stringArrayList As New ArrayList

    For Each o As Object In arrayList

      stringArrayList.Add(o.ToString())

    Next

    Return String.Join(separator, stringArrayList.ToArray(GetType(String)))

  End Function

 To illustrate its intended behavior, here is an example NUnit test (assumes function is placed in a "Utility" class):

Imports NUnit.Framework
Imports System.Text

<TestFixture()> Public Class TestUtility

  <Test()> Public Sub ArrayListToDelimString()

    Dim sb As New StringBuilder("3")

    Dim arrayList As New ArrayList
    arrayList.Add(1)
    arrayList.Add("2")
    arrayList.Add(sb)

    Assert.AreEqual("1,2,3", Utility.ArrayListToDelimString(arrayList, ",")) 'comma (CSV)
    Assert.AreEqual("1" & vbTab & "2" & vbTab & "3", Utility.ArrayListToDelimString(arrayList, vbTab)) 'tab
    Assert.AreEqual("1" & vbCrLf & "2" & vbCrLf & "3", Utility.ArrayListToDelimString(arrayList, vbCrLf))  '1 per line

    Console.Out.WriteLine(Utility.ArrayListToDelimString(arrayList, ","))
    Console.Out.WriteLine(Utility.ArrayListToDelimString(arrayList, vbTab))
    Console.Out.WriteLine(Utility.ArrayListToDelimString(arrayList, vbCrLf))

  End Sub

End Class

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