VB.net save a list to settings

Hi. I was given the following code that I use to save a list of items
against a class object. I want to be able to assign this to a Setting
How do I do this so that when I close and open the project I can
reuse the list?

Module Module1

    Sub Main()
        Dim objCls As New Class1

        objCls.JointTables = "Tab1"
        objCls.JointTables = "Tab2"
        objCls.JointTables = "Tab3"
        objCls.JointTables = "Tab2"


    End Sub

End Module

Public Class Class1


    Private _pJoinTables As String

    Public Sub New()
        _pJoinTables = ""
    End Sub

    Property JointTables() As String
        Get
            Return _pJoinTables
        End Get
        Set(ByVal sValue As String)
            If (Not _pJoinTables.Contains(sValue)) Then
                _pJoinTables = _pJoinTables & "," & sValue 'Error on this line first &
            End If
        End Set
    End Property

End Class