C#.net窗体无法显示数据库fk中kss表的信息

sql2000企业管理器中编的
如图：无显示
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Data.SqlClient;namespace 数据库
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();                  }        private void Form1_Load(object sender, EventArgs e)
        {
            string strRow = "";
            string sqlstr = "select *   from [fk].[dbo].[kss]";
            string str = "server=(local);Integrated Security=SSPI;database=fk";
            SqlConnection con = new SqlConnection(str);
            con.Open();
            SqlCommand cmd = new SqlCommand(sqlstr, con);
            SqlDataReader dr = cmd.ExecuteReader();
            while (dr.Read())
            {
                strRow = dr.GetString(0);
                strRow = strRow + ":" + dr.GetString(1);
                strRow = strRow + ":" + dr.GetString(2);
                strRow = strRow + ":" + dr.GetString(3);                listBox1.Text = listBox1.Text + strRow + (char)10 + (char)13;
            }
            dr.Close();
            con.Close();
            label1.Text = "学生信息";
        }
    }
}