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Treeview Control in Visual Basic .Net

Treeview Control in Visual Basic .Net

A tree-view control is a window that displays a hierarchical list of items, such as the headings in a document, the entries in an index, or the files and directories on a disk.

In this program, you are allowed to create a node under a root node, user can also select a node and that selected node will then appear in a message box.

Source code:

Public Class Form1

    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        TreeView1.Nodes.Add("Programming", "Programming")
        TreeView1.Nodes("Programming").Nodes.Add("Visual Basic.net")
        TreeView1.Nodes("Programming").Nodes.Add("C#")
        TreeView1.Nodes("Programming").Nodes.Add("Java")
        TreeView1.Nodes.Add("Database", "Database")
        TreeView1.Nodes("Database").Nodes.Add("MS Access")
        TreeView1.Nodes("Database").Nodes.Add("MySQL")
        TreeView1.Nodes("Database").Nodes.Add("SQL Server")
        TreeView1.Nodes.Add("SearchEngine", "Search Engine")
        TreeView1.Nodes("SearchEngine").Nodes.Add("Google")
        TreeView1.Nodes("SearchEngine").Nodes.Add("Bing")
        TreeView1.Nodes("SearchEngine").Nodes.Add("Ask")
        TreeView1.Nodes.Add("Websites", "Websites")
        TreeView1.Nodes("Websites").Nodes.Add("webgeekresources.com")
        TreeView1.Nodes("Websites").Nodes.Add("inettutor.com")
    End Sub


    Private Sub TreeView1_NodeMouseDoubleClick(ByVal sender As Object, ByVal e As System.Windows.Forms.TreeNodeMouseClickEventArgs) Handles TreeView1.NodeMouseDoubleClick
        MessageBox.Show("Selected Node: " + TreeView1.SelectedNode.Text)
    End Sub

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        If TextBox1.Text = "" Or ComboBox1.Text = "" Then
            MessageBox.Show("please enter details")
        Else
            TreeView1.Nodes(ComboBox1.Text).Nodes.Add(TextBox1.Text)
            MessageBox.Show("node added")

        End If
    End Sub
End Class