ConnectionString 属性尚未初始化。
说明: 执行当前 Web 请求期间，出现未经处理的异常。请检查堆栈跟踪信息，以了解有关该错误以及代码中导致错误的出处的详细信息。
异常详细信息: System.InvalidOperationException: ConnectionString 属性尚未初始化。
源错误:
行 272: strSql.Append(" where "+strWhere);
行 273: }
行 274: return DbHelperSQL.Query(strSql.ToString());
行 275: }
行 276:
源文件: C:\Users\Administrator\Desktop\9AListeningEnglishFrist\9AListeningEnglish_DLL\DAL\Sys_User.cs 行: 274
堆栈跟踪:
[InvalidOperationException: ConnectionString 属性尚未初始化。]
System.Data.SqlClient.SqlConnection.PermissionDemand() +5316006
System.Data.SqlClient.SqlConnectionFactory.PermissionDemand(DbConnection outerConnection) +20
System.Data.ProviderBase.DbConnectionClosed.TryOpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory, TaskCompletionSource`1 retry, DbConnectionOptions userOptions) +143
System.Data.SqlClient.SqlConnection.TryOpen(TaskCompletionSource`1 retry) +83
System.Data.SqlClient.SqlConnection.Open() +96
Maticsoft.DBUtility.DbHelperSQL.Query(String SQLString) +99
_9AListeningEnglish_DLL.DAL.Sys_User.GetList(String strWhere) in C:\Users\Administrator\Desktop\9AListeningEnglishFrist\9AListeningEnglish_DLL\DAL\Sys_User.cs:274
_9AListeningEnglish.SystemManage.UserManagement.DateLoad() in C:\Users\Administrator\Desktop\9AListeningEnglishFrist\9AListeningEnglish\SystemManage\UserManagement.aspx.cs:77
_9AListeningEnglish.SystemManage.UserManagement.Page_Load(Object sender, EventArgs e) in C:\Users\Administrator\Desktop\9AListeningEnglishFrist\9AListeningEnglish\SystemManage\UserManagement.aspx.cs:22
System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +51
System.Web.UI.Control.OnLoad(EventArgs e) +92
System.Web.UI.Control.LoadRecursive() +54
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +670
