Visual Basic 2008 Recipes: A Problem-Solution Approach

9.17. Use a Drag-and-Drop Operation

Problem

You need to use the drag-and-drop feature to exchange information between two controls (possibly in separate windows or in separate applications).

Solution

Start a drag-and-drop operation using the DoDragDrop method of the Control class, and then respond to the DragEnter and DragDrop events.

How It Works

A drag-and-drop operation allows the user to transfer information from one place to another by clicking an item and dragging it to another location. A drag-and-drop operation consists of the following three basic steps:

1. The user clicks a control, holds down the mouse button, and begins dragging. If the control supports the drag-and-drop feature, it sets aside some information.

2. The user drags the mouse ...