为什么这样，w3wp进程就报错呢？

public class userinfor2
{  
public string wanbi = "";
        public string jifen = "";
        public string dian = "";
        public string WanBi
        {
            get { return wanbi; }        }
        public string JiFen
        {
            get { return JiFen; }        }
        public string Dian
        {
            get { return Dian; }        }
        /// <summary>
        /// 获取用户最账户信息
        /// </summary>
        public void seluser()
        {
            using (SqlConnection cn = new SqlConnection(SqlHelper.ConnectionStringLocalTransaction))
            {
                cn.Open();
                string id = mdcode.MD5Decrypt2(HttpContext.Current.Request.Cookies["userclient"]["id"], mdcode.sKey2);// "";//用户id
                SqlCommand cm = new SqlCommand("select top 1 * from u_uinfor where uId=" + id + "", cn);
                SqlDataReader dr = cm.ExecuteReader();
                while (dr.Read())
                {
                    wanbi = dr["Uwan"].ToString();
                    jifen = dr["Upoints"].ToString();
                    dian = dr["Umoney"].ToString();
                }
                dr.Close();
                cn.Close();
            }
        }
}
调用的地方
  protected void Page_Load(object sender, EventArgs e)
    {
        use.userinform ue = new use.userinform();        ue.seluser();
        this.lbjifen .Text = ue.JiFen;
        this.lbwanbi.Text = ue.WanBi;
        this.lbdian.Text = ue.Dian;
    }