การ Serializable ใน VB.NET ช่วยตอบด้วยครับ คำถามคือ ทำไมถึงทำ Deserializable ไม่ได้ครับ

Imports System.IO
Imports System.Runtime.Serialization
Imports System.Runtime.Serialization.Formatters.Binary
Imports System.Runtime.Serialization.SerializationInfo
<Serializable()> _
    Class Class1
    Implements ISerializable
    Public Event Result(ByVal iRet As Integer)
    Private mN1 As Integer
    Private mN2 As Integer

    Private mNumList() As Class2
    Public Property NumList() As Class2()
        Get
            Return mNumList
        End Get
        Set(ByVal value() As Class2)
            ReDim mNumList(value.Length - 1)
            mNumList = value
        End Set
    End Property
    Public Property N1() As Integer
        Get
            Return mN1
        End Get
        Set(ByVal value As Integer)
            mN1 = value
        End Set
    End Property
    Public Property N2() As Integer
        Get
            Return mN2
        End Get
        Set(ByVal value As Integer)
            mN2 = value
        End Set
    End Property
    Public Function AddNumber() As Boolean
        RaiseEvent Result(mN1 + mN2)
        Return True
    End Function
    Public Function AddNumber(ByVal N1 As Integer, ByVal N2 As Integer) As Boolean
        mN1 = N1
        mN2 = N2
        RaiseEvent Result(N1 + N2)
        Return True
    End Function

    Public x As Int32
    Private Sub New(ByVal info As SerializationInfo, ByVal context As StreamingContext)
        Dim num() As Class2
        x = info.GetInt32("x")
        mN1 = info.GetInt32("N1")
        mN2 = info.GetInt32("N2")
        num = CType(info.GetValue("NumList", num.GetType()), Class2())
        NumList = num
    End Sub
    Public Sub New()
        x = 100
    End Sub
    Sub GetObjectData(ByVal info As SerializationInfo, ByVal context As StreamingContext) Implements ISerializable.GetObjectData
        info.AddValue("x", x)
        info.AddValue("N1", mN1)
        info.AddValue("N2", mN2)
        info.AddValue("NumList", mNumList, mNumList.GetType())
    End Sub
End Class
=====================================================
<Serializable()> _
Public Class Class2
    Private mGrade As Integer
    Public Property Grade() As Integer
        Get
            Return mGrade
        End Get
        Set(ByVal value As Integer)
            mGrade = value
        End Set
    End Property
End Class

======================================
Imports System.IO
Imports System.Runtime.Serialization
Imports System.Runtime.Serialization.Formatters.Binary
Imports System.Runtime.Serialization.SerializationInfo
Imports System.Xml.Serialization
Public Class Form1
    Dim WithEvents dwe As New Class1
    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim fs As New System.IO.FileStream("c:\temp\data1.bin", IO.FileMode.OpenOrCreate)
        Dim bf As New System.Runtime.Serialization.Formatters.Binary.BinaryFormatter()
        bf.Serialize(fs, dwe)
        fs.Close()
        Me.Text = dwe.NumList.Length - 1
    End Sub

    Private Sub Button5_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button5.Click
        Dim fs As New System.IO.FileStream("c:\temp\data1.bin", IO.FileMode.Open)
        Dim bf As New System.Runtime.Serialization.Formatters.Binary.BinaryFormatter()
        dwe = CType(bf.Deserialize(fs), Class1)
        txtN1.Text = dwe.N1
        txtN2.Text = dwe.N2
        Me.Text = dwe.NumList.Length - 1
        fs.Close()
    End Sub
    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
        dwe.AddNumber()
        txtN1.Text = dwe.N1
        txtN2.Text = dwe.N2
    End Sub

    Private Sub dwe_Result(ByVal iRet As Integer) Handles dwe.Result
        MessageBox.Show("Result Is " & iRet)
    End Sub

    Private Sub Button6_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button6.Click
        dwe.AddNumber(5, 10)
        txtN1.Text = dwe.N1
        txtN2.Text = dwe.N2
    End Sub

    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        Dim Y() As Class2
        Dim I As Integer
        ReDim Y(9)
        For I = 0 To 9
            Y(I) = New Class2
            Y(I).Grade = I
        Next I
        dwe.NumList = Y
    End Sub
End Class