Question

I have a problem regarding TReeview and combo box.
Problem:
I have a Treeview with Parent and Child Nodes.
I have a drop box or a combo box. Whenever I select a value from the combobox it should automatically select the same node in the treeview list.

Please give me suggestions on how to perform this.

This is what I tried so far:

protected void nav_dd_parent_SelectedIndexChanged(object sender, EventArgs e)
{
       nav_treeview.selectedvalue = nav_dd_parent.selectedvalue.tostring();
}

But it says that nav_treeview is read only and it can not be assigned any values.

Answer 1

I just tried the following to give you an example:

HTML:

<asp:TreeView ID="TreeView1" runat="server">
</asp:TreeView>
<br />
<br />
<asp:DropDownList ID="DropDownList1" runat="server" AutoPostBack="true" OnSelectedIndexChanged="DropDownList1_SelectedIndexChanged">
</asp:DropDownList>

Code Behind:

 protected void Page_Load(object sender, EventArgs e)
    {
        if (!Page.IsPostBack)
        {
            Dictionary<string, Int32> myList = new Dictionary<string, Int32>();
            myList.Add("Text1", 1);
            myList.Add("Text2", 2);
            myList.Add("Text3", 3);
            myList.Add("Text4", 4);
            myList.Add("Text5", 5);

            foreach (KeyValuePair<string, Int32> s in myList)
            {
                this.TreeView1.Nodes.Add(new TreeNode(s.Key, s.Value.ToString()));
                this.DropDownList1.Items.Add(new ListItem(s.Key, s.Value.ToString()));
            }
            foreach (TreeNode tn in this.TreeView1.Nodes)
            {
                tn.ChildNodes.Add(new TreeNode("Hello World"));
                tn.Collapse();
            }
        }
    }

    protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
    {
        if (this.DropDownList1.SelectedItem != null)
        {
            foreach (TreeNode tn in this.TreeView1.Nodes)
            {
                if (tn.Value == this.DropDownList1.SelectedItem.Value)
                {
                    tn.Selected = true;
                    if (tn.ChildNodes.Count > 0)
                    {
                        tn.Expand();
                    }
                }
                else {
                    tn.Collapse();
                }
            }
        }
    }

Hopefully this is what you needed. Good luck!