[InvalidOperationException: The ConnectionString property has not been initialized.]
System.Data.SqlClient.SqlConnection.PermissionDemand() +7122241
System.Data.SqlClient.SqlConnectionFactory.PermissionDemand(DbConnection outerConnection) +32
System.Data.ProviderBase.DbConnectionInternal.TryOpenConnectionInternal(DbConnection outerConnection, DbConnectionFactory connectionFactory, TaskCompletionSource`1 retry, DbConnectionOptions userOptions) +315
System.Data.SqlClient.SqlConnection.TryOpenInner(TaskCompletionSource`1 retry) +128
System.Data.SqlClient.SqlConnection.TryOpen(TaskCompletionSource`1 retry) +265
System.Data.SqlClient.SqlConnection.Open() +133
MathExpress.DataAccess.UserInfoDAOTableAdapters.UserInfoTab_BadgesTableAdapter.Count(Nullable`1 UserID) in D:\2023\HTN\Src\MathExpress\DataAccess\UserInfoDAO.Designer.cs:12420
ME_NguoiSuDung_UserControl_BadgesControl.LoadData() +278
System.Web.UI.Control.OnLoad(EventArgs e) +108
System.Web.UI.Control.LoadRecursive() +90
System.Web.UI.Control.LoadRecursive() +185
System.Web.UI.Control.LoadRecursive() +185
System.Web.UI.Control.LoadRecursive() +185
System.Web.UI.Control.LoadRecursive() +185
System.Web.UI.Control.LoadRecursive() +185
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1533
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