[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
System.Data.Common.DbDataAdapter.FillInternal(DataSet dataset, DataTable[] datatables, Int32 startRecord, Int32 maxRecords, String srcTable, IDbCommand command, CommandBehavior behavior) +182
System.Data.Common.DbDataAdapter.Fill(DataTable[] dataTables, Int32 startRecord, Int32 maxRecords, IDbCommand command, CommandBehavior behavior) +465
System.Data.Common.DbDataAdapter.Fill(DataTable dataTable) +147
MathExpress.DataAccess.ThuVienDAOTableAdapters.ChuDeThuVienTableAdapter.GetDataByTenChuDe(String TenChuDe, Nullable`1 PhanLoaiNoiDungThuVien) in D:\2023\HTN\Src\MathExpress\DataAccess\ThuVienDAO.Designer.cs:15226
ME_ThuVien_ThuVien_ChuDeChuyenDe.Page_Load(Object sender, EventArgs e) +366
System.Web.UI.Control.OnLoad(EventArgs e) +108
System.Web.UI.Control.LoadRecursive() +90
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1533
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