How to add a node to TreeView Control at runtime in VB.NET

A TreeView control of Visual basic is used to Display hierarical data in a tree format.this control is Helpful to represent the organization structure, file system or any other system in which you need hierarchical representation.this control is similar to windows explorer which shows a TreeView in left side to show all folder on the hard disk.In TreeView Control You can add nodes and sub nodes.this control provides you the option to add the nodes at design time as well as at runtime.you generally add the nodes at runtime.you can expand and collpase these nodes by clicking on them.the default Event of the TreeView Control is AfterSelect Event.

Properties of TreeView Control:-

• TreeView:-you can get the parent TreeView.
   
• Nodes:-you can get the collection of nodes in the current node.
   
• FirstNode:-you can get the first child tree node.
   
• LastNode:-you can get the last child Node.
   
• NextNode:-you can get the next sibling node.
  
  
  How to add a node in TreeView control at runtime:-
   
• Open a new Project
   
• Drag the TreeView Control on form like below
  
  
   
• Write the code behind form load

      Private Sub Form1_Load(ByVal sender As System.Object,ByVal e As System.EventArgs)Handles
          MyBase.Load
          With TreeView1
              .BeginUpdate()
              .Nodes.Add("Node0")
              .Nodes(0).Nodes.Add("Node1")
              .Nodes(0).Nodes.Add("Node2")
              .Nodes.Add("Node3")
              .Nodes(1).Nodes.Add("Node4")
              .Nodes(1).Nodes.Add("Node5")
              .Nodes.Add("Node6")
              .Nodes(2).Nodes.Add("Node7")
              .EndUpdate()
          End With
      End Sub
   

• Select the AfterSelect Event of TreeView Control and add below code on this Event

     Private Sub TreeView1_AfterSelect(ByVal sender As Object,ByVal e As
          System.Windows.Forms.TreeViewEventArgs)Handles TreeView1.AfterSelect
          MessageBox.Show(TreeView1.SelectedNode.FullPath())
      End Sub

• Now execute the above code.node will be added

  Output:-