Control.DragDrop Event


The .NET API Reference documentation has a new home. Visit the .NET API Browser on to see the new experience.

Occurs when a drag-and-drop operation is completed.

Namespace:   System.Windows.Forms
Assembly:  System.Windows.Forms (in System.Windows.Forms.dll)

public event DragEventHandler DragDrop

The X and Y properties of the DragEventArgs are in screen coordinates, not client coordinates. The following line of Visual C# code converts the properties to a client Point.

Point clientPoint = targetControl.PointToClient(new Point(de.X, de.Y));

In versions earlier than .NET Framework 2.0, if you put a UserControl with DragEnter and DragDrop events on a Windows Form and drag and drop something onto the UserControl at design time, the DropDrop and DropEnter events are raised. However, when you close and reopen the solution, the DragEnter and DragDrop events are not raised again.

For more information about handling events, see Handling and Raising Events.

This code excerpt demonstrates using the DragDrop event. See the DoDragDrop method for the complete code example.

private void ListDragTarget_DragDrop(object sender, System.Windows.Forms.DragEventArgs e) 
    // Ensure that the list item index is contained in the data.
    if (e.Data.GetDataPresent(typeof(System.String))) {

        Object item = (object)e.Data.GetData(typeof(System.String));

        // Perform drag-and-drop, depending upon the effect.
        if (e.Effect == DragDropEffects.Copy ||
            e.Effect == DragDropEffects.Move) {

            // Insert the item.
            if (indexOfItemUnderMouseToDrop != ListBox.NoMatches)
                ListDragTarget.Items.Insert(indexOfItemUnderMouseToDrop, item);

    // Reset the label text.
    DropLocationLabel.Text = "None";

.NET Framework
Available since 1.1
Return to top