Hi all,

          I am having a TreeView on a aspx page. its working fine. I have written following code on TreeView1_SelectedNodeChanged.

        string strSql = "select a.MemberId,a.FirstName,a.LastName,a.Orgnization,a.City from mtblContacts as a INNER JOIN mtblGrpCon as b ON b.MemberId=a.MemberId and b.id=" + TreeView1.SelectedNode.Value + "";
        DataTable dt = new DataTable();
        dt = myCls.My_Datatable(strSql);
        if (dt.Rows.Count > 0)
        {
            Dg.DataSource = dt;
            Dg.DataBind();
        }

first of all I want to add sql parameters to this code. How to do that.

Now its working fine on simple .aspx form but when i use masterpage attached to this page ans also having <asp:UpdatePanel id="UpdatePanel1" runat="server">(using ajax)

then when i click any node or subnode of this treeview, this seems to like there are automatically adding similar nodes to clicked nodes on every click. but in backend from which DB table i bounded this there is no updation regarding nodes adding, means there is no effet to Db table. but on the page on every click it shows like you are adding nodes or subnodes to clicked node.

what the issue i didn't get.

let me know pls..

thanx

check your page_load, are you adding things here, and do you need to wrap this in a !ispostback

No its in  postback like

if (!IsPostBack)

{

PopulateRootLevel();

}

so it should be like

if (!IsPostBack)

{

}

PopulateRootLevel();

thanx

 try this. Where ever you are creating the menu, enclose the following code.

                if (!Page.IsPostBack)
                {
                    //Write your tree creation code here
                    PopulateRootLevel();
                }

 I am editing the code after seeing your post

I did same as u said

if (!IsPostBack)
        {
            PopulateRootLevel();
        }

private void PopulateRootLevel()
    {
        string strSql = "select id,title,(select count(*) FROM mtblTest "
    + "WHERE parentid=sc.id) childnodecount FROM mtblTest sc where parentid IS NULL";
        DataTable dt = new DataTable();
        dt = myCls.My_Datatable(strSql);
        if (dt.Rows.Count > 0)
        {
            PopulateNodes(dt, TreeView1.Nodes);

        }
    }

same results

thanx

 Are you sure that you are not calling the "PopulateRootLevel();" any where else in the page ????

Yea I am sure, i m not using PopulateRootLevel() in other place on the page.

Have you assign any URLs to the NavigateUrl property of the TreeNode?

Missed this really.

Any control be it treeview nodes, link button..  that has the property NavigateURL and not being set makes the page the Postback twice even if there was only one event to make the postback.

Good guess Hong-Gang Chen

I am binding treeview to DB. I dont need NavigateURL property. it auto link from DB. Then why should i set this property? if its nessasary then what should i set to this property.

thanx