Question

I want to make a treeview structure like this. I can only find an example on how to copy nodes.

But I don’t know how to organize it to folders, to move nodes between them. Any advice will be very helpful.
I’m using winforms.

Answer 1

Basically you are going to have a recursive loop like so:

protected void Populate(TreeNode parentNode, DirectoryInfo directory)
{
    foreach (DirectoryInfo dir in directory.GetDirectories())
    {
        TreeNode node = parentNode.Nodes[dir.Name] 
            ?? parentNode.Nodes.Add(dir.Name, dir.Name);
        node.Tag = dir;
        // node.ContextMenuStrip = cmenu;
        Populate(node, dir);
    }
}

To drag and drop with TreeView, see this Microsoft example.