Transfer Item first ListBox to second ListBox & second ListBox to first ListBox in VB.NET.

CODEING:

Public Class Form1
    Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
        If ListBox1.SelectedIndex = -1 Then
            MsgBox("Select Items!")
        Else
            ListBox2.Items.Add(ListBox1.SelectedItem)
            ListBox1.Items.Remove(ListBox1.SelectedItem)
        End If
    End Sub
    Private Sub Button2_Click(sender As Object, e As EventArgs) Handles Button2.Click
        For i As Integer = 0 To ListBox1.SelectedItems.Count - 1
            ListBox2.Items.Add(ListBox1.SelectedItem)
            ListBox1.Items.Remove(ListBox1.SelectedItem)
        Next
    End Sub
    Private Sub Button3_Click(sender As Object, e As EventArgs) Handles Button3.Click
        ListBox2.Items.AddRange(ListBox1.Items)
        ListBox1.Items.Clear()
    End Sub
    Private Sub Button4_Click(sender As Object, e As EventArgs) Handles Button4.Click
        If ListBox2.SelectedIndex = -1 Then
            MsgBox("Select Items!")
        Else
            ListBox1.Items.Add(ListBox2.SelectedItem)
            ListBox2.Items.Remove(ListBox2.SelectedItem)
        End If
    End Sub
    Private Sub Button5_Click(sender As Object, e As EventArgs) Handles Button5.Click
        For i As Integer = 0 To ListBox2.SelectedItems.Count - 1
            ListBox1.Items.Add(ListBox2.SelectedItem)
            ListBox2.Items.Remove(ListBox2.SelectedItem)
        Next
    End Sub
    Private Sub Button6_Click(sender As Object, e As EventArgs) Handles Button6.Click
        ListBox1.Items.AddRange(ListBox2.Items)
        ListBox2.Items.Clear()
    End Sub
End Class

DESIGNING: