System.NullReferenceException: 未将对象引用设置到对象的实例
报错：SqlConnection conn = new SqlConnection();
行 105:
行 106: conn.ConnectionString = ConfigurationManager.ConnectionStrings["connectString"].ToString();
行 107:
行 108:
源文件: d:\OA数据备份20101217\OA数据备份20101217\OA8000\OAsystem\admin\tt\AddNews.aspx.cs 行: 106
堆栈跟踪:
[NullReferenceException: 未将对象引用设置到对象的实例。]
admin_tt_AddNews.AddRoot() in d:\OA数据备份20101217\OA数据备份20101217\OA8000\OAsystem\admin\tt\AddNews.aspx.cs:106
admin_tt_AddNews.Page_Load(Object sender, EventArgs e) in d:\OA数据备份20101217\OA数据备份20101217\OA8000\OAsystem\admin\tt\AddNews.aspx.cs:18
System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e) +14
System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +35
System.Web.UI.Control.OnLoad(EventArgs e) +99
System.Web.UI.Control.LoadRecursive() +50
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +627
web.config代码
<appSettings>
<add key="FCKeditor:BasePath" value="~/FCKeditor/"/>
<add key="FCKeditor:UserFilesPath" value="~/uploadFiles"/>
<add key="imagesfolder" value="~/File/"/>
<add key="yuanimg" value="~/File/"/>
<add key="ActiveTimeout" value="30" />
<add key="RefreshTimeout" value="1" />
<add key="refreshUrl" value="Refresh.aspx" />
<add key="ConnectionString" value="Data Source=LENOVO-PC\SQL2005;Initial Catalog=OAs;Persist Security Info=True;User ID=sa;Password=123456"/>
</appSettings>
<connectionStrings>
<add name="OAsystemConn" connectionString="Data Source=LENOVO-PC\SQL2005;Initial Catalog=OAs;User ID=sa;Password=123456" providerName="System.Data.SqlClient"/>
<add name="OAsystemConnectionString1" connectionString="Data Source=LENOVO-PC\SQL2005;Initial Catalog=OAs;User ID=sa" providerName="System.Data.SqlClient"/>
求帮助！！ --------------------编程问答-------------------- conn.ConnectionString = ConfigurationManager.ConnectionStrings["OAsystemConn"].ConnectionString; --------------------编程问答-------------------- or
ConfigurationManager.AppSettings["ConnectionString"].ToString() --------------------编程问答-------------------- 楼上的说明很清楚了
不要混淆，张冠李戴就行了。
--------------------编程问答-------------------- 还是不行！！会是虚拟路径路径的问题么？没有读到web.config？ --------------------编程问答--------------------
按楼上改了报什么错 --------------------编程问答-------------------- 跟原来的一样
补充：.NET技术 , ASP.NET
