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Server Error in '/' Application.

The ConnectionString property has not been initialized.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. Exception Details: System.InvalidOperationException: The ConnectionString property has not been initialized. Source Error:
An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.
Stack Trace:
[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.BaiToanDAOTableAdapters.BaiToanCauHoiTableAdapter.TangLuotXem(Nullable`1 IDBaiToan, Nullable`1 SiteID) in D:\2023\HTN\Src\MathExpress\DataAccess\BaiToanDAO.Designer.cs:15266 ME_HoiDapToanHoc_QuestionDetail.TangLuotXem() +256 ME_HoiDapToanHoc_QuestionDetail.Page_Load(Object sender, EventArgs e) +477 System.Web.UI.Control.OnLoad(EventArgs e) +108 System.Web.UI.Control.LoadRecursive() +90 System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1533
Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.8.4110.0

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