[2008] n Tier, Classes and Data Access

[BukHix]

This is what I have so far.

Public Function ProcessSave() _
        As Boolean Implements MDIInterface.ProcessSave
 
        Dim success As Boolean
        Dim aCust As Customer = Nothing
        Try
            aCust.ContactName = txtContact.Text
            aCust.Notes = txtNotes.Text
            aCust.Save()
            Return success
        Catch ex As Exception
            MessageBox.Show(ex.Message & vbNewLine & ex.StackTrace)
        End Try
 
    End Function

I get this error Object reference not set to an instance of an object.

at PTWin.frmCustomer.ProcessSave() When I try to do a save.