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private void Form1_Load(object sender, EventArgs e)
{
TreeView1.ExpandAll();
}
private void TreeView1_BeforeCheck(object sender, TreeViewCancelEventArgs e)
{
if (e.Node.Level == 0)
{
e.Cancel = true;
}
}
private void TreeView1_NodeMouseDoubleClick(object sender, TreeNodeMouseClickEventArgs e)
{
if (e.Node.Level == 0)
{
e.Node.Checked = false;
}
}