ASP.NET TreeView根据数据库动态生成

数据库结构
Tb_department表
D_ID 部门编号
D_Name 部门名称
D_Tel 联系电话
D_Address 联系地址
D_Chief 负责人,
D_Belong 所属部门

Tb_employee表
E_ID 职工编号
E_Name 职工姓名
E_Sex 职工性别
E_Tel 联系电话
E_Address 联系地址
E_Birth 出生年月
D_Name 所属部门

前台aspx
<asp:TreeView ID="TreeView1" runat="server" ImageSet="Faq" Width="162px">
                    <ParentNodeStyle Font-Bold="False" />
                    <HoverNodeStyle Font-Underline="True" ForeColor="Purple" />
                    <SelectedNodeStyle Font-Underline="True" HorizontalPadding="0px" VerticalPadding="0px" />
                    <NodeStyle Font-Names="Tahoma" Font-Size="8pt" ForeColor="DarkBlue" HorizontalPadding="5px"
                        NodeSpacing="0px" VerticalPadding="0px" />
</asp:TreeView>

后台代码aspx.cs
protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            TreeViewBind();
        }
    }
    #region 主从表绑定
    private void TreeViewBind()
    {
        SqlConnection cn1 = new SqlConnection(ConfigurationManager.ConnectionStrings["Mispersonalconn"].ConnectionString);
        SqlCommand mycmd1 = new SqlCommand("select * from [Tb_department]", cn1);
        SqlDataAdapter da1 = new SqlDataAdapter(mycmd1);
        DataSet ds1 = new DataSet();
        da1.Fill(ds1, "Tb_department");//读出大类

        for (int i = 0; i < ds1.Tables["Tb_department"].Rows.Count; i++)
        {
            TreeNode td1 = new TreeNode();
            TreeNode departmentlist = new TreeNode("部门列表","","","","");
            TreeView1.Nodes.Add(departmentlist);
            td1.Text = ds1.Tables["Tb_department"].Rows[i]["D_Name"].ToString();//大类部门列表
            td1.Value = ds1.Tables["Tb_department"].Rows[i]["D_ID"].ToString();
            td1.NavigateUrl = "~/WebFiles/List.aspx?D_ID=" + td1.Value + "&" + "D_Name=" + td1.Text;//连接地址
            departmentlist.ChildNodes.Add(td1);

            SqlConnection cn2 = new SqlConnection(ConfigurationManager.ConnectionStrings["Mispersonalconn"].ConnectionString);
            SqlCommand mycmd2 = new SqlCommand("select * from [Tb_employee] where D_Name = '" + ds1.Tables["Tb_department"].Rows[i]["D_Name"].ToString() + "'", cn2);
            SqlDataAdapter da2 = new SqlDataAdapter(mycmd2);
            DataSet ds2 = new DataSet();
            da2.Fill(ds2, "Tb_employee");//读出小类

            for (int j = 0; j < ds2.Tables["Tb_employee"].Rows.Count; j++)
            {
                TreeNode td2 = new TreeNode();
                td2.Text = ds2.Tables["Tb_employee"].Rows[j]["E_Name"].ToString();//小类
                //td2.NavigateUrl = "~/WebFiles/List.aspx?D_ID={0}&D_Name={1}";//连接地址
                td1.ChildNodes.Add(td2);
            }
        }

        TreeView1.DataBind();
    }
    #endregion