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private void treeView1_AfterSelect(object sender, TreeViewEventArgs e)
{
TreeNode node = e.Node;
if (node.Nodes.Count == 0)
return;
if (node.Checked)
node.Nodes.OfType<TreeNode>().ToList().ForEach(x => x.Checked = true);
else
node.Nodes.OfType<TreeNode>().ToList().ForEach(x => x.Checked = false);
}