How to collapse a TreeNode and its children?

The method TreeNode.Collapse(Boolean) can be used to collapse a TreeNode and optionally its children.

• passing false value when want to collapse itself and its children
• passing true value when you want to collapse a node but leave its child nodes in their expanded state.

The TreeView.CollapseAll() method collapses all the TreeNode objects, including all the descendant tree nodes in the TreeView control.