private

void

treeView1_AfterCheck(

object

sender, TreeViewEventArgs e)

{

   

if

(e.Action

!=

TreeViewAction.ByMouse)

       

return

;

    SetParentNode(e.Node);

    SetChildNode(e.Node);

}

private

void

SetParentNode(TreeNode node)

{

   

if

(node.Level

>

0

)

    {

        node.Parent.Checked

=

true

;

        SetParentNode(node.Parent);

    }

}

private

void

SetChildNode(TreeNode node)

{

   

foreach

(TreeNode childNode

in

node.Nodes)

    {

        childNode.Checked

=

node.Checked;

       

if

(node.Nodes.Count

>

0

)

SetChildNode(childNode);

    }

}