C# WinForms - DragDrop within the same TreeViewControl

Question

I'm attempting to implement a DragDrop of a treeview item within the same control.

I want to be able to move an item from 1 node to another.

Here is my current code, When I run this I can see the item has started the drag but the windows icon will not allow it to be dropped to any nodes on the Control.

My current code

private void treeView1_ItemDrag(object sender, ItemDragEventArgs e)
{
    DoDragDrop(e.Item, DragDropEffects.Move);
}

private void treeView1_DragEnter(object sender, DragEventArgs e)
{
    e.Effect = DragDropEffects.Move;
}

private void treeView1_DragDrop(object sender, DragEventArgs e)
{
    if (e.Data.GetDataPresent(typeof(TreeNode)))
    {
        TreeNode sourceNode = e.Data.GetData(typeof(TreeView)) as TreeNode;

        var item = new TreeNode(sourceNode.Text);


        System.Drawing.Point pt = ((TreeView)sender).PointToClient(new System.Drawing.Point(e.X, e.Y));
        TreeNode DestinationNode = ((TreeView)sender).GetNodeAt(pt);

        DestinationNode.Nodes.Add(item);
        DestinationNode.Expand();
    }
}

Answer 1

Just modify treeView1_DragDrop function to:

private void treeView1_DragDrop(object sender, DragEventArgs e)
{
    // Retrieve the client coordinates of the drop location.
    Point targetPoint = treeView1.PointToClient(new Point(e.X, e.Y));

    // Retrieve the node at the drop location.
    TreeNode targetNode = treeView1.GetNodeAt(targetPoint);

    // Retrieve the node that was dragged.
    TreeNode draggedNode = (TreeNode)e.Data.GetData(typeof(TreeNode));

    // Confirm that the node at the drop location is not 
    // the dragged node and that target node isn't null
    // (for example if you drag outside the control)
    if (!draggedNode.Equals(targetNode) && targetNode != null)
    {
        // Remove the node from its current 
        // location and add it to the node at the drop location.
        draggedNode.Remove();
        targetNode.Nodes.Add(draggedNode);

        // Expand the node at the location 
        // to show the dropped node.
        targetNode.Expand();
    }
}