ListBox1 拖放

Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        Me.ListBox1.AllowDrop = True
        Me.ListBox2.AllowDrop = True
        Me.ListBox1.Items.Add("1")
        Me.ListBox1.Items.Add("2")
    End Sub

    Private Sub ListBox1_MouseDown(ByVal sender As System.Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles ListBox1.MouseDown
        If Me.ListBox1.SelectedIndex >= 0 Then
            Me.ListBox1.DoDragDrop(Me.ListBox1.SelectedItem.ToString, DragDropEffects.Copy)
        End If
    End Sub

    Private Sub ListBox2_DragEnter(ByVal sender As System.Object, ByVal e As System.Windows.Forms.DragEventArgs) Handles ListBox2.DragEnter
        e.Effect = DragDropEffects.Copy
    End Sub

    Private Sub ListBox2_DragDrop(ByVal sender As System.Object, ByVal e As System.Windows.Forms.DragEventArgs) Handles ListBox2.DragDrop
        If e.Data.GetDataPresent(DataFormats.Text) Then
            Me.ListBox2.Items.Add(e.Data.GetData(DataFormats.Text))
        End If
    End Sub