Hello sir,
I want similar coding for treeview, where for linklabel is as follows.

Private Sub LinkLabel8_LinkClicked(ByVal sender As System.Object, ByVal e As System.Windows.Forms.LinkLabelLinkClickedEventArgs) Handles LinkLabel8.LinkClicked
        WebBrowser1.Navigate(Application.StartupPath & "\source\test.html\")
    End Sub

I solved this, use file name in the tag with the extension and use the below coding and Source is the folder name i used in my project.

WebBrowser1.Navigate(Application.StartupPath & "\Source\" & e.Node.Tag)