TreeView Check Nodes and Unselect Nodes

I have having trouble Checking nodes with the logic below. Can someone tell me what i am missing?

private void tvTestSequence_AfterCheck(object sender, TreeViewEventArgs e)

{

if (e.Action != TreeViewAction.Unknown)

{

if (e.Node.Nodes.Count > 0)

{

if (!e.Node.Checked)

{

this.CheckAllChildNodes(e.Node, e.Node.Checked);

}

if (e.Node.Parent != null)

{

TreeNode n = e.Node;

while (n.Parent != null)

{

if (n.Checked)

{

n.Parent.Checked = true;

}

n = n.Parent;

}

private void CheckAllChildNodes(TreeNode treeNode, bool nodeChecked)

{

foreach (TreeNode node in treeNode.Nodes)

{

node.Checked = nodeChecked;

if (node.Nodes.Count > 0)

{

this.CheckAllChildNodes(node, nodeChecked);

}