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程序总是出现“ConnectionString 属性尚未初始化”怎么回事阿

热度:7878   发布时间:2013-02-26 00:00:00.0
程序总是出现“ConnectionString 属性尚未初始化”咋回事阿?
前台代码是这样的:(只是放了个DataList控件)

<%@   Page   Language= "C# "Debug=true   AutoEventWireup= "true "   CodeFile= "Default2.aspx.cs "   Inherits= "Default2 "   %>

<!DOCTYPE   html   PUBLIC   "-//W3C//DTD   XHTML   1.0   Transitional//EN "   "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd ">

<html   xmlns= "http://www.w3.org/1999/xhtml "   >
<head   runat= "server ">
        <title> 无标题页 </title>
</head>
<body>
        <form   id= "form1 "   runat= "server ">
        <div>
                <asp:DataList   ID= "DataList2 "   runat= "server ">
                </asp:DataList> </div>
        </form>
</body>
</html>


后台代码如下   :


using   System;
using   System.Data;
using   System.Configuration;
using   System.Collections;
using   System.Web;
using   System.Web.Security;
using   System.Web.UI;
using   System.Web.UI.WebControls;
using   System.Web.UI.WebControls.WebParts;
using   System.Web.UI.HtmlControls;

public   partial   class   Default2   :   System.Web.UI.Page
{
        protected   void   Page_Load(object   sender,   EventArgs   e)
        {
                if   (!IsPostBack)
                {
                        bind();
                }
        }
        private   void   bind()
        {
                DB   sdb   =   new   DB();
                DataList2.DataSource   =   sdb.dt( "select   *   from   student ");
                DataList2.DataKeyField   =   "no ";
                DataList2.DataBind();
                Response.Write( "绑定2成功 ");
        }
}


其中用到的类文件代码如下:


using   System;
using   System.Data;
using   System.Configuration;
using   System.Web;
using   System.Web.Security;
using   System.Web.UI;
using   System.Web.UI.WebControls;
using   System.Web.UI.WebControls.WebParts;
using   System.Web.UI.HtmlControls;
using   System.Data.OleDb;
///   <summary>
///   DB   的摘要说明
///   </summary>
public   class   DB
{
        public   static   string   strConnection;
        private   int   pagesize;
        public   DB()
        {
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