Hello,

I'm using the Microsoft Web Control.  I'm dynamically loading the control with data from the database where there are parent nodes and children nodes that could be up to 5 levels.  I have a Javascript function that executes when a parent node is checked to automatically select all the children below it.  Now I have to figure out a way to find out what nodes are selected so that I can process them properly.  The only way I see this happening is if I create a hidden variable and loop through all the nodes in the TreeView and add the nodes to the variable if they are checked.  However, I'm having a problem looping though the nodes.  The only information I found was the SelectNodeIndex property which just gives me the node that was selected.  

This is my TreeView Format:

• Folder10  
• Folder1
• Item1
• Folder2
• Item2
• Folder 11
• Folder 3
• Item4
• Item5
• Folder 12
• Folder4
• Folder5
• Folder6
• Item6
• Folder 13
• Item7

I need to find out which Item was selected in the TreeView.  So lets say that I checked the Folder10 and Folder12 (all the subfolders and items are selected automatically).  Then I want the hidden variable to hold all the selected nodes in this format;

Variable = Folder10_1_item1 (So the each parent node selected would start of with text "Folder" then the ID of the folder, then an "_" which means there is a child. Then the ID of the subFolder and then the text "item" and then the ID)

 So If I selected Folder10 and Folder12 in the TreeView, I would like the variable to hold this information

Variable = Folder10_1_item1;Folder10_2_item2;Folder12_4_5_6_Item6

 Can someone please help?  How can I loop through each node of the treeview to achieve this.

 Thank you

Here's a couple of subs I put together to loop through all treenodes.  I had to loop through the tree for a node with a specific value to select and expand it.  hope this helps.

For Each tn As TreeNode In TreeView1.Nodes

If tn.Value = searchValue Then

Exit For

End If

If tn.ChildNodes.Count > 0 Then

Next

End If

Next

End Sub

If tn.Value = searchValue Then

Exit Sub

End If

If tn.ChildNodes.Count > 0 Then

Next

End If

End Sub

I found that there is a property in the treeview CheckedNodes which gives list of nodes that are checked. Is there a opposite property which gives unchecked nodes from the treeview?

 i've made some changes in your code:

you will call with  SelectNodesRecursive(what node to select ex:"10", name of the treeview ex: treeview1);

public static void SelectNodesRecursive(string searchValue,TreeView Tv)
    {
        foreach (TreeNode tn in Tv.Nodes)
        {
            if (tn.Value == searchValue)
            {
                tn.Expand();
                tn.Select();
                break;
            }

            if (tn.ChildNodes.Count > 0)
            {
                foreach (TreeNode cTn in tn.ChildNodes)
                {
                    int a = SelectChildrenRecursive(cTn, searchValue);
                    if (a == 1)
                    {
                        tn.Expand();
                    }
                }
            }
        }
    }


    private static int SelectChildrenRecursive(TreeNode tn, string searchValue)
    {
        if (tn.Value == searchValue)
        {
            //if(tn.Parent.Parent!=null)
            //{
            // tn.Parent.Parent.Expand();
            //}
            //if (tn.Parent != null)
            //{
            //    tn.Parent.Expand();
            //}

            tn.Expand();
            tn.Select();
            return 1;
        }
        else
        {
            // tn.Parent.Collapse();
            tn.Collapse();
        }
        if (tn.ChildNodes.Count > 0)
        {
            foreach (TreeNode tnC in tn.ChildNodes)
            {
                int a = SelectChildrenRecursive(tnC, searchValue);
                if (a == 1)
                {
                    tn.Expand();
                    return 1;
                }

            }

        }
        return 0;
    }

 hi there...

 can you give me an example how did you execute those functions? i need it badly.. thanks a lot...