VB.NET两个LISTBOX进行交换数据

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles BtnRightMove.Click, LstAll.DoubleClick      '右移数据
        If LstAll.SelectedItems.Count > 0 Then
            If LstPart.Items.Contains(LstAll.SelectedItem) Then Exit Sub
            LstPart.Items.Add(LstAll.SelectedItem)
            LstAll.Items.Remove(LstAll.SelectedItem)
        End If
    End Sub

    Private Sub Button6_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles BtnLeftMove.Click, LstPart.DoubleClick         '左移数据
        If LstPart.SelectedItems.Count > 0 Then
            If LstAll.Items.Contains(LstPart.SelectedItem) Then Exit Sub
            LstAll.Items.Add(LstPart.SelectedItem)
            LstPart.Items.Remove(LstPart.SelectedItem)
        End If
    End Sub

    Private Sub Button4_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles BtnRightAll.Click        '右移全部数据
        If LstAll.Items.Count < 1 Then Exit Sub
        ' Dim LstItem As Object
        'For Each LstItem In LstAll.Items
        '    If Not LstPart.Items.Contains(LstItem) Then
        '        LstPart.Items.Add(LstItem)
        '    End If
        'Next
        'Dim i As Integer, nCount As Integer
        'nCount = LstAll.Items.Count
        ''For i = 1 To nCount
        ''    LstAll.Items.AddRange(LstAll.Items)
        ''Next
        '  LstAll.Items.Remov
        LstPart.Items.AddRange(LstAll.Items)
        LstAll.Items.Clear()
    End Sub

    Private Sub BtnLeftAll_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles BtnLeftAll.Click       '左移全部数据
        If LstPart.Items.Count < 1 Then Exit Sub
        'Dim LstItem As Object
        'For Each LstItem In LstPart.SelectedItems
        '    If Not LstAll.Items.Contains(LstItem) Then
        '        LstAll.Items.Add(LstItem)
        '    End If
        '    'LstPart.Items.Remove(LstItem)
        '    'Me.ListBox2.Items.AddRange(Me.ListBox1.Items)
        '    'Me.ListBox1.Items.Clear()
        'Next
        'Dim i As Integer, nCount As Integer
        'nCount = LstPart.SelectedItems.Count
        'For i = 1 To nCount
        '    LstPart.Items.Remove(LstPart.SelectedItem)
        'Next
        LstAll.Items.AddRange(LstPart.Items)
        LstPart.Items.Clear()
    End Sub