It does: or at least in my version of VS it does! But not from the Design window, strangely...
Don't forget, to get it to work, you need to add code to your events:
txtDetail.AllowDrop = true;
txtDetail.DragEnter += txtDetail_DragEnter;
txtDetail.DragDrop += txtDetail_DragDrop;
}
void txtDetail_DragEnter(object sender, DragEventArgs e)
{
e.Effect = DragDropEffects.Copy;
}
void txtDetail_DragDrop(object sender, DragEventArgs e)
{
...
}
If you don't set the Effect, then DragDrop will not work.