انتقال مقادیر خاصیت Text دو تکست باکس از طریق Drag & Drop

private void textBox_DragDrop(object sender, DragEventArgs e)
{
    TextBox txt = (TextBox)sender;
    txt.Text = (string)e.Data.GetData(DataFormats.Text);
}
  
private void textBox_DragEnter(object sender, DragEventArgs e)
{
    if (e.Data.GetDataPresent(DataFormats.Text))
    {
        e.Effect = DragDropEffects.Copy;
    }
    else
    {
        e.Effect = DragDropEffects.None;
    }
}
  
private void textBox_MouseDown(object sender, MouseEventArgs e)
{
    TextBox txt = (TextBox)sender;
    txt.SelectAll();
    txt.DoDragDrop(txt.Text, DragDropEffects.Copy);
}
  
private void Form1_Load(object sender, EventArgs e)
{
    textBox2.DragDrop += new DragEventHandler(this.textBox_DragDrop);
    textBox2.MouseDown += new MouseEventHandler(this.textBox_MouseDown);
    textBox2.DragEnter += new DragEventHandler(this.textBox_DragEnter);
    textBox1.DragDrop += new DragEventHandler(this.textBox_DragDrop);
    textBox1.MouseDown += new MouseEventHandler(this.textBox_MouseDown);
    textBox1.DragEnter += new DragEventHandler(this.textBox_DragEnter);
    textBox1.AllowDrop = textBox2.AllowDrop = true;
}