TreeView control is used to display hierarchical tree like information such as a directory hierarchy. The top level in a tree view are root nodes that can be expanded or collapsed if the nodes have child nodes.
The user can expand the TreeNode by clicking the plus sign (+) button, if one is displayed next to the TreeNode, or you can expand the TreeNode by calling the TreeNode.Expand method. When a parent node is expanded, its child nodes are visible. You can also navigate through tree views with various properties: FirstNode, LastNode, NextNode, PrevNode, NextVisibleNode, PrevVisibleNode.
The fullpath method of treeview control provides the path from root node to the selected node.
Tree nodes can optionally display check boxes. To display the check boxes, set the CheckBoxes property of the TreeView to true.
TreeView1.CheckBoxes = True
The following Vb.Net program shows a simple demonstration of treeview control