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How can i copy from a treeview control to a text box or list box. Please help me soon.

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  • Latest Post Latest Post by Diamonddrake

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Quick clarification and a couple of ready-to-use VB.NET examples that address both WinForms and ASP.NET scenarios (since the thread mixes those). asked how to "copy" from a TreeView to a TextBox or ListBox; asked for code; gave a direct Windows Forms pointer. Note: .NET strings are reference types but immutable, so assigning node text into a TextBox or adding it to a ListBox is safe and does not require any special deep-copying.

Windows Forms (VB.NET): handle the tree's selection event and either set the TextBox.Text or add to ListBox.Items. Example:

Private Sub TreeView1_AfterSelect(sender As Object, e As TreeViewEventArgs) Handles TreeView1.AfterSelect
    If TreeView1.SelectedNode IsNot Nothing Then
        TextBox1.Text = TreeView1.SelectedNode.Text
        ListBox1.Items.Add(TreeView1.SelectedNode.Text)
    End If
End Sub

ASP.NET WebForms (VB.NET): ensure controls have runat="server" and nodes allow selection (TreeNode.SelectAction set appropriately). Server-side SelectedNodeChanged is commonly used:

Protected Sub TreeView1_SelectedNodeChanged(sender As Object, e As EventArgs) Handles TreeView1.SelectedNodeChanged
    If TreeView1.SelectedNode IsNot Nothing Then
        TextBox1.Text = TreeView1.SelectedNode.Text
        ListBox1.Items.Add(New ListItem(TreeView1.SelectedNode.Text))
    End If
End Sub

If the goal is copying the whole tree (or many nodes), use a simple recursive helper to walk child nodes and add each text to the ListBox. Common gotchas: confirm the correct control types (WinForms vs WebForms), wire the event handler, check for null/Nothing, and use node.Value (WebForms) or node.Tag (WinForms) if you need an ID rather than displayed text.

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Member Avatar for kvprajapati

How can i copy from a treeview control to a text box or list box. Please help me soon.

Want to give us the code you have so far and some further explanation?

Member Avatar for Diamonddrake

by "copy" do you simply mean take the text from the treeview (treeview? huh, title says listbox) and have it be displayed in a textbox or listbox.

Strings are Reference type, so "copying" the information is substantially more complicated than assigning a reference to the text property of a textbox.

but the short answer is textbox.text = treeview.SelectedNode.Text; The text property that all classes the inherit from the System.Windows.Forms.Control class contains whatever text is being displayed by that control. On a form, its the title caption, on a label its the display text, in a textbox its the text that's in it, and in the Node class that represents a member of a tree view its the text displayed on that node.

so you simple set the text property of the control you want to "copy" the text to with the text property of the control you want to "copy" the text from.

If you can't tell... I'm really bored right now... this is probably the simplest question I have ever seen on this forum... and normally silly questions like this one don't get answered. Because it will take you longer to read this long post than it would have to google it and find the answer.

for a free project to download with dozens of lines of source code try http://www.c-sharpcorner.com/uploadfile/scottlysle/treeviewbasics04152007195731pm/treeviewbasics.aspx

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