Tree node event for fetching the selected node

Back after one year of CHANGE !!!

A few days ago one of my friend had a question about tree node, he wanted to copy the text of selected node else the app should not copy. So I did some R&D on events available with tree node. Its the OnSelectedNodeChanged..


Here is sample code for the same :)
 *********ASPX Code****************


   
   


   

   

       
   

       
            OnTreeNodeExpanded="TreeView1_TreeNodeExpanded"
            onselectednodechanged="TreeView1_SelectedNodeChanged">
       
   

   

***************************************

*****Code behind***********


protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            Bind_tree();
        }
    }
    public void Bind_tree()
    {
        DataTable dt = Get_District();
        for (int i = 0; i < dt.Rows.Count; i++)
        {
            TreeNode no = new TreeNode();
            no.Text = dt.Rows[i]["District"].ToString();
            no.Value = dt.Rows[i]["District"].ToString();
            Get_allNodes(no);
            this.TreeView1.Nodes.Add(no);
        }
    }
    public void Get_allNodes(TreeNode no)
    {
        DataTable dt = Get_Arealist();
        DataRow[] rows = dt.Select("District='" + no.Value + "'");
        for (int i = 0; i < rows.Length; i++)
        {
            TreeNode child = new TreeNode();
            child.Text = rows[i]["Area"].ToString();
            child.Value = rows[i]["Area"].ToString();
            no.ChildNodes.Add(child);
            Get_allNodes(child);
        }
    }


    // You can get the data from your own database.
    // I get the datatable like this in order to run the sample more conveniently.
    public DataTable Get_District()
    {
        DataTable dt = new DataTable();
        DataRow dr;
        string Name = "District_1,District_2,District_3";
        string ID = "1,2,3";
        string[] list1 = Name.Split(',');
        string[] list2 = ID.Split(',');
        dt.Columns.Add(new DataColumn("District"));
        dt.Columns.Add(new DataColumn("ID"));
        for (int i = 0; i < list1.Length; i++)
        {
            dr = dt.NewRow();
            dr["District"] = list1[i];
            dr["ID"] = list2[i];
            dt.Rows.Add(dr);
        }
        return dt;
    }

    // You can get the data from your own database.
    // I get the datatable like this in order to run the sample more conveniently.
    public DataTable Get_Arealist()
    {
        DataTable dt = new DataTable();
        DataRow dr;
        string Name = "Area_1,Area_2,Area_3,Area_4,Area_5";
        string Dis = "District_1,District_1,District_1,District_3,Area_1";
        string ID = "1,2,3,4,5";
        string[] list1 = Name.Split(',');
        string[] list2 = Dis.Split(',');
        string[] list3 = ID.Split(',');
        dt.Columns.Add(new DataColumn("Area"));
        dt.Columns.Add(new DataColumn("District"));
        dt.Columns.Add(new DataColumn("ID"));
        for (int i = 0; i < list1.Length; i++)
        {
            dr = dt.NewRow();
            dr["Area"] = list1[i];
            dr["District"] = list2[i];
            dr["ID"] = list3[i];
            dt.Rows.Add(dr);
        }
        return dt;
    }
    protected void TreeView1_TreeNodeExpanded(object sender, TreeNodeEventArgs e)
    {
        TreeNodeCollection ts = null;
        if (e.Node.Parent == null)
        {
            ts = ((TreeView)sender).Nodes;
        }
        else
            ts = e.Node.Parent.ChildNodes;
        foreach (TreeNode node in ts)
        {
            if (node == e.Node)
            {
                node.Expand();
            }
            else
            {
                node.Collapse();
            }
        }

    }
    protected void TreeView1_SelectedNodeChanged(object sender, EventArgs e)
    {
        TreeNodeEventArgs xm = new TreeNodeEventArgs(this.TreeView1.SelectedNode);
        TreeView1_TreeNodeExpanded(sender, xm);
        string value = this.TreeView1.SelectedNode.Text;
        this.Label1.Text = value;
        Page.ClientScript.RegisterStartupScript(this.GetType(), "Ming", "Getvalue('" + value + "')", true);
    }



Happy Coding :)