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private void ExpandAllNodes(TreeView treeView)
{
    foreach (TreeNode node in treeView.Nodes)
    {
        ExpandNodeAndChildren(node);
    }
}

private void ExpandNodeAndChildren(TreeNode node)
{
    node.Expand();

    foreach (TreeNode childNode in node.Nodes)
    {
        ExpandNodeAndChildren(childNode);
    }
}

// 鍦ㄩ渶瑕佺殑鍦版柟璋冪敤灞曞紑鎵€鏈夎妭鐐圭殑鏂规硶
ExpandAllNodes(myTreeView);

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