Hvad går der galt? arraylist.capacity

Hvad går der galt ?
Jeg er ny i vb.net, men mener at aMatch.Capacity retunerer længden af arrayet !!?

Jeg får fejlen:
An unhandled exception of type 'System.ArgumentOutOfRangeException' occurred in mscorlib.dll
Additional information: Index was out of range.  Must be non-negative and less than the size of the collection.


Koden:
        Dim rRegEx As Regex
        Dim mMatch As Match
        Dim aMatch As New ArrayList()
        Dim nr As Integer

        rRegEx = New Regex("img.*src\s*=\s*(?:""(?<1>[^""]*)""|(?<1>\S+))", RegexOptions.IgnoreCase Or RegexOptions.Compiled)
        mMatch = rRegEx.Match(strHTML)

        While mMatch.Success
            Dim sMatch As String
            sMatch = mMatch.Groups(1).ToString
            aMatch.Add(sMatch)
            mMatch = mMatch.NextMatch()

        End While

        For n = 0 To aMatch.Capacity
            ListBox1.Items.Add(aMatch(n))
        Next