[vb.Net] restituire nothing evento new classe

[andreaciao_22]

salve ragazzi,

stò facendo un programma che sistema il contenuto file txt in quanto ho un programma vb che poi lo dovrà analizzare...

volevo sapere c'è un modo per restituire il valore nothing se qualcosa va storto all'inizializzazione della classe che conterrà i dati di ogni singola bAnca?

CODICE:

Public Class Form1
    Dim arrBanche As ArrayList
    Private Sub Form1_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
        Dim arrRighe As String(), b As Banca
        arrRighe = LeggiFile("c:\tababicab.txt")
        If arrrighe IsNot Nothing Then
            arrBanche = New ArrayList
            For Each s As String In arrRighe
                b = New Banca(s)

                If b IsNot Nothing Then 
                    ListBox1.Items.Add(b.Descrizione)
                    arrBanche.Add(b)
                End If 
 
            Next
        End If
        arrRighe = Nothing
    End Sub
    Function LeggiFile(ByVal strPath As String) As String()
        Dim content As String, SR As System.IO.StreamReader
        SR = New System.IO.StreamReader(strPath)
        content = SR.ReadToEnd
        SR.Close()
        SR = Nothing
        If content IsNot Nothing Then
            Return content.Split(ControlChars.Tab)
        Else
            Return Nothing
        End If
    End Function
End Class

CODICE DELLA CLASSE:

Public Class Banca
    Private intABI As Integer
    Private strDescrizione As String
    Private intCAB As Integer
    Private strFiliale As String
    Private strIndirizzo As String
    Private strLocalità As String
    Private intCAP As Integer
    Private strProvincia As String
    Private dtData As DateTime
    ReadOnly Property ABI() As Integer
        Get
            Return intABI
        End Get
    End Property

    ReadOnly Property Descrizione() As String
        Get
            Return strDescrizione
        End Get
    End Property

    ReadOnly Property CAB() As Integer
        Get
            Return intCAB
        End Get
    End Property

    ReadOnly Property Filiale() As String
        Get
            Return strFiliale
        End Get
    End Property

    ReadOnly Property Indirizzo() As String
        Get
            Return strIndirizzo
        End Get
    End Property

    ReadOnly Property Località() As String
        Get
            Return strLocalità
        End Get
    End Property

    ReadOnly Property CAP() As Integer
        Get
            Return intCAP
        End Get
    End Property

    ReadOnly Property Provincia() As String
        Get
            Return strProvincia
        End Get
    End Property

    ReadOnly Property Data() As DateTime
        Get
            Return dtData
        End Get
    End Property

    Public Sub New(ByVal Stringa As String)
        Dim arrCampi As String()
        arrCampi = Stringa.Split(ControlChars.Tab)
        If Not IsNumeric(arrCampi(0)) Then
            MyBase.Finalize()
            Exit Sub
        End If
        intABI = CInt(arrCampi(0))
        strDescrizione = arrCampi(1)
        arrCampi = Nothing
    End Sub
End Class