求简化代码.解决办法

    public partial class index : System.Web.UI.Page

    {


        DB db = new DB();

        protected void Page_Load(object sender, EventArgs e)

        {

            head_index();

            head_index1();

            head_index2();

            head_index3();

            head_index4();

            head_index5();

        }

        public void head_index()

        {


            string sql = "select id,navigation from navigation";

            DataTable dt = db.reDt(sql);

            head_one.DataSource = dt;

            head_one.DataBind();

        }

        public void head_index1()

        {

            int id = string.IsNullOrEmpty(Request.QueryString["id"]) ? 0 : int.Parse(Request.QueryString["id"]);

            string sql = "select id,navigation_Name from navigation_Name where navigation_id = 1";

            DataTable dt = db.reDt(sql);

            head_1.DataSource = dt;

            head_1.DataBind();

        }

        public void head_index2()

        {

            int id = string.IsNullOrEmpty(Request.QueryString["id"]) ? 0 : int.Parse(Request.QueryString["id"]);

            string sql = "select id,navigation_Name from navigation_Name where navigation_id = 2";

            DataTable dt = db.reDt(sql);

            head_2.DataSource = dt;

            head_2.DataBind();

        }

        public void head_index3()

        {

            int id = string.IsNullOrEmpty(Request.QueryString["id"]) ? 0 : int.Parse(Request.QueryString["id"]);

            string sql = "select id,navigation_Name from navigation_Name where navigation_id = 3";

            DataTable dt = db.reDt(sql);

            head_3.DataSource = dt;

            head_3.DataBind();

        }

        public void head_index4()

        {

            int id = string.IsNullOrEmpty(Request.QueryString["id"]) ? 0 : int.Parse(Request.QueryString["id"]);

            string sql = "select id,navigation_Name from navigation_Name where navigation_id = 4";

            DataTable dt = db.reDt(sql);

            head_4.DataSource = dt;

            head_4.DataBind();

        }

        public void head_index5()

        {

            int id = string.IsNullOrEmpty(Request.QueryString["id"]) ? 0 : int.Parse(Request.QueryString["id"]);

            string sql = "select id,navigation_Name from navigation_Name where navigation_id = 5";