我们经常会遇到这样的操作，那就是复制一个文本的内容到另外一个，此

小程序利用设置TextBox控件的AllowDrop属性和为TextBox控件的MouseDow

_n，DragDrop事件添加处理程序，从而实现将一个TextBox控件中的文字串

拖放到另一个TextBox控件中。

 Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        '设置TextBox控件支持拖放操作
        Me.TextBox1.AllowDrop = True
        Me.TextBox2.AllowDrop = True
    End Sub
    '开始拖放textBox1控件中的文字
    Private Sub TextBox1_MouseDown(ByVal sender As System.Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles TextBox1.MouseDown
        If (e.Button = Windows.Forms.MouseButtons.Left) Then
            Me.TextBox1.SelectAll()
            Me.TextBox1.DoDragDrop(Me.TextBox1.SelectedText, _
                     DragDropEffects.Move Or DragDropEffects.Copy)
        End If
    End Sub
    '当用户在拖放操作过程中首次将鼠标光标拖到控件上时发生
    Private Sub TextBox2_DragEnter(ByVal sender As System.Object, ByVal e As System.Windows.Forms.DragEventArgs) Handles TextBox2.DragEnter
        If (e.Data.GetDataPresent(DataFormats.Text)) Then
            e.Effect = DragDropEffects.Copy
        End If
    End Sub
    '在完成将textBox1中的文字拖放到textBox2时发生
    Private Sub TextBox2_DragDrop(ByVal sender As System.Object, ByVal e As System.Windows.Forms.DragEventArgs) Handles TextBox2.DragDrop
        Me.TextBox2.Text = e.Data.GetData(DataFormats.Text).ToString()
        '判断是否按下了Ctrl键
        If ((e.KeyState & 8) <> 8) Then
            Me.TextBox1.Text = ""
        End If
    End Sub

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