problem with TreeNodeExpanded event System.Web.UI.WeBControls)

Posted on 2010-08-25
Last Modified: 2013-11-08
I 've inserted a TreeView Control into my WebPart class. Everything works properly as long as i don't try tu use TreeNodeExpanded event.When i do that after expanding root the whole control collaps and returns to original state - where all leafs are hidden. Some sample code below.I 've created this control as a class library because later on ideploy my web part to sharepoint services. In general what i want to get is formating text of each node after expanding the tree so that all elements where in proper "column".
in advance thank you for your help
_treeView.TreeNodeExpanded += new TreeNodeEventHandler(someAction);

public void someAction(object sender, EventArgs args)


            this.l1.Text = "dasda";


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Question by:Mateusz_Smietanka

Expert Comment

by:Akin Delu
ID: 33522897
does your treeView get populated from database, if so check your page_load event confirm that you have
if (!Page.IsPostBack)
             //your database binding code goes here
LVL 16

Expert Comment

by:Vikram Singh Saini
ID: 33528743

Accepted Solution

Mateusz_Smietanka earned 0 total points
ID: 33528971
I programmatically populate the tree basing on querry send to SSAS.
private void CreateTreeStruct()


            AdomdConnection conn = new AdomdConnection("Data Source=v-poldim;Catalog=testCube");


            AdomdCommand command = new AdomdCommand("select {[Measures].[amount],[measures].[assumption]} on 0,{[proj].[hierarchy].MEMBERS} on 1 from [AX5 SP1 POLDIM SANDBOX] ", conn);

            CellSet _cellSet = command.ExecuteCellSet();

            // get an axe, ax.1 == rows

            Axis axe = _cellSet.Axes[1];

            cc = _cellSet.Cells;

            int k = 0;

            MyTreeNode parent = null;

            foreach (Position position in axe.Positions)



                this.AddChild(ref parent, position.Members[0].Caption, GetLabelText(position.Members[0].Caption));

                k += 2;


           // _treeView = new TreeView();

            _treeView.ControlStyle.Font.Name = "Courier New";

            //_treeView.ControlStyle.BackColor = Color.Beige;

            _treeView.ControlStyle.Font.Size = 12;

            panel = new Panel();

            l1 = new Label();

            l1.Text =" Project    Ammount    Assumption";

            l1.BackColor = Color.FromArgb(255,100,100,100);

            l1.Font.Size = 13;

            l1.Width = _treeView.Width;










private void AddChild(ref MyTreeNode parent, String childValue, string label)


            if (parent == null)


                parent = new MyTreeNode(label, childValue);


                /* label= "       " + label;

                 label = label.Replace(" "," ");

                 parent.Text = label;*/



            if (parent.ChildNodes.Count == 0)


                parent.ChildNodes.Add(new MyTreeNode(label, childValue));



            if (childValue.Length == 0)


            MyTreeNode node = null;

            //foreach (MyTreeNode node in parent.ChildNodes)

            for (int i = 0; i < parent.ChildNodes.Count; i++)


                node = (MyTreeNode)parent.ChildNodes[i];

                switch (isAncestor(node.Value, childValue))


                    case -1:

                        //parent.ChildNodes.Add(new MyTreeNode(childName, null));



                    case 0:

                        this.AddChild(ref node, childValue, label);


                    case 1:

                        node.ChildNodes.Add(new MyTreeNode(label, childValue));

                        return; ;



            parent.ChildNodes.Add(new MyTreeNode(label, childValue));


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