ASP.NET实现文章上下篇

     protected void updown()
    {
        int id = Convert.ToInt32(Request.QueryString["id"].ToString());
        string sqlUp = string.Format("select top 1 title, max(id) as id from blog where id<'{0}' group by title order by id desc",id);
        string sqlDown = string.Format("select top 1 title, min(id) as id from blog where id>'{0}' group by title order by id asc",id);
        SqlConnection con = DataBase.createCon();
        con.Open();
        SqlCommand cmdUp = new SqlCommand(sqlUp,con);
        SqlDataReader drUp = cmdUp.ExecuteReader();
        if (drUp.Read())
        {
            hyperUp.Text = drUp["title"].ToString();
            hyperUp.NavigateUrl = "~/BlogView.aspx?id="+drUp["id"].ToString();
        }
        else
        {
            hyperUp.Text = "没有了";
        }
        cmdUp.Dispose();
        drUp.Close();
        SqlCommand cmdDown = new SqlCommand(sqlDown, con);
        SqlDataReader drDown = cmdDown.ExecuteReader();
        if (drDown.Read())
        {
            hyperDown.Text = drDown["title"].ToString();
            hyperDown.NavigateUrl = "~/BlogView.aspx?id=" + drDown["id"].ToString();
        }
        else
        {
            hyperDown.Text = "没有了";
        }
        cmdDown.Dispose();
        drDown.Close();
        con.Close();
    }