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how to add TreeNode to TreeNodeCollection?

Posted on 2006-06-25
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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?
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Question by:latsubs
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Mike Tomlinson earned 150 total points
ID: 16980764
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
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