Want to protect your cyber security and still get fast solutions? Ask a secure question today.Go Premium

x
  • Status: Solved
  • Priority: Medium
  • Security: Public
  • Views: 733
  • Last Modified:

how to add TreeNode to TreeNodeCollection?

how to correctly add TreeNode to TreeNodeCollection? i have tried the following:

Dim tnc As TreeNodeCollection
Dim tn As New TreeNode
tn.Text = "TEST NODE"
tn.Nodes.Add("TEST SUBNODE")
tnc.Add(tn)

when i call this code i get System.NullRefernceException error 'Object reference not set to an instance of an object". however the TreeNodeCollection data type does not have constructors (i cannot use the New keyword). so how do i use the TreeNodeCollection? more generally, can i use TreeNodeCollection as a non-visual TreeView?
0
latsubs
Asked:
latsubs
1 Solution
 
Mike TomlinsonMiddle School Assistant TeacherCommented:
You could always create a TreeView and just not add it to your form...

Public Class Form1

    Private tv As TreeView
    Private tnc As TreeNodeCollection

    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        tv = New TreeView
        tnc = tv.Nodes

        Dim tn As New TreeNode
        tn.Text = "TEST NODE"
        tn.Nodes.Add("TEST SUBNODE")
        tnc.Add(tn)
    End Sub

End Class
0

Featured Post

[Webinar] Database Backup and Recovery

Does your company store data on premises, off site, in the cloud, or a combination of these? If you answered “yes”, you need a data backup recovery plan that fits each and every platform. Watch now as as Percona teaches us how to build agile data backup recovery plan.

Tackle projects and never again get stuck behind a technical roadblock.
Join Now