how to place data in treeview from database

i used below coding to fetch data from database to bind in treeview., i am getting fromdate details according to selected company from table., for example if i choose A then i am getting treeview like

A
 --20/10/2012
A
 --23/10/2012
A
 --27/10/2012
A
 --29/10/2012

but actual i want like

A
 --20/10/2012
 --23/10/2012
 --27/10/2012
 --29/10/2012

private void ShowMenu_Click(object sender, EventArgs e)
{

    try
    {
        gn.cnopen();
        cmd = new SqlCommand("FETCH_CONFERENCE_HALL_DETAILS_MENUS", gn.cn());
        cmd.CommandType = CommandType.StoredProcedure;
        cmd.Parameters.AddWithValue("@TYPE", 2);
        cmd.Parameters.AddWithValue("@FROM_DATE", "");
        cmd.Parameters.AddWithValue("@TO_DATE", "");
        cmd.Parameters.AddWithValue("@COMPANYNAME",ddlcompanyname.SelectedItem.ToString());

        DataTable dt = new DataTable();
        SqlDataAdapter da = new SqlDataAdapter(cmd);


        TreeNode trn;

        TreeNode node;
        TreeNode[] array;

            treeView1.Nodes.Clear();
            dt.Clear();
            da.Fill(dt);

            string cmn = dt.Rows[0]["company_name"].ToString();
           if (dt.Rows.Count > 0)
            {
               for (int cn = 0; cn <= dt.Rows.Count - 1; cn++)
                {
                    string getfrmdate = dt.Rows[cn]["fromdate"].ToString();

                    node = new TreeNode(getfrmdate);
                    getfrmdate = "";
                    array = new TreeNode[] { node };
                    trn = new TreeNode(cmn, array);
                    treeView1.Nodes.Add(trn);

               }
            }

    }
    catch (SqlException err)
    {
        MessageBox.Show(err.Message, "", MessageBoxButtons.OK, MessageBoxIcon.Error);
    }
}

[edit]code block added[/edit]

Tags: C#