''附近有语法错误

Question

using System;
using System.Configuration;
using System.Collections;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using System.Data.SqlClient;public partial class _Default : System.Web.UI.Page 
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!Page.IsPostBack)
        {
            SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["con"].ConnectionString);
            con.Open();
            string cmdtext = "select top 8　* from odrers";
            SqlCommand cmd = new SqlCommand(cmdtext, con);
            SqlDataReader dr = cmd.ExecuteReader();
            
            if (dr.Read())
            {
                this.GridView1.DataSource = dr;
                this.GridView1.DataBind();
                cmd.Dispose();
                cmd.Close();
            }
            else
            {
                Response.Write("没有查询到数据!");
            }
        }
    }
    
}
执行的时候出现 :' ' 附近有语法错误。说明：数据库是使用的系统自带的NorthWind中的orders表