字符串的语法异常 在查询表达式 '1=1 and NType='tzgg order by NOrderNum asc, NAddTime desc' 中

字符串的语法错误 在查询表达式 '1=1 and NType='tzgg order by NOrderNum asc, NAddTime desc' 中
 public partial class index1 : System.Web.UI.Page
    {
        private InfoBLL infobll = new InfoBLL();
        private AboutBLL aboutbll = new AboutBLL();
        protected String type
        {
            get
            {
                return Request.QueryString["type"];
            }
            set
            {
                type = value;
            }
        }
        private int page
        {

            get
            {
                if (!String.IsNullOrEmpty(Request["page"]))
                {
                    return Int32.Parse(Request.QueryString["page"] + "");
                }
                return 1;
            }
            set
            {
                page = value;
            }
        }

        protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                BindData();
            }
        }
        private void BindData()
        {
            rep_list1.DataSource = infobll.GetInfoList("and NType='tzgg");
            //rep_list1.DataSource = rep_list1.GetList("6", "");
            //Repeater1.DataSource = GetList("10", "");
            this.rep_list1.DataBind();
            this.rep_list.DataSource = infobll.GetInfoList(6,"tjyd");
            this.rep_list.DataBind();

            BLL.LinkBLL by = new  T_angel.BLL.LinkBLL();
            Repeater1.DataSource = by.GetLinkList("");
            Repeater1.DataBind();



高手帮看看错哪了
------解决方案--------------------
我很奇怪，为何在tagg前加单引号？  

要加的话，也是加两个，转义用
------解决方案--------------------
 infobll.GetInfoList("  and NType='tzgg'    ");

  
*****************************************************************************
签名档： http://feiyun0112.cnblogs.com/