[InvalidOperationException: The ConnectionString property has not been initialized.]
System.Data.SqlClient.SqlConnection.PermissionDemand() +7117013
System.Data.SqlClient.SqlConnectionFactory.PermissionDemand(DbConnection outerConnection) +30
System.Data.ProviderBase.DbConnectionInternal.TryOpenConnectionInternal(DbConnection outerConnection, DbConnectionFactory connectionFactory, TaskCompletionSource`1 retry, DbConnectionOptions userOptions) +312
System.Data.SqlClient.SqlConnection.TryOpenInner(TaskCompletionSource`1 retry) +202
System.Data.SqlClient.SqlConnection.TryOpen(TaskCompletionSource`1 retry) +413
System.Data.SqlClient.SqlConnection.Open() +128
System.Data.Common.DbDataAdapter.FillInternal(DataSet dataset, DataTable[] datatables, Int32 startRecord, Int32 maxRecords, String srcTable, IDbCommand command, CommandBehavior behavior) +172
System.Data.Common.DbDataAdapter.Fill(DataTable[] dataTables, Int32 startRecord, Int32 maxRecords, IDbCommand command, CommandBehavior behavior) +453
System.Data.Common.DbDataAdapter.Fill(DataTable dataTable) +141
clsDatabase.getDataTable(String strSql) in c:\website\WEB_DAI_BIEU_QUOC_HOI\App_Code\dao\clsDatabase.cs:153
ASP.print_aspx.__Render__control1(HtmlTextWriter __w, Control parameterContainer) in c:\website\WEB_DAI_BIEU_QUOC_HOI\print.aspx:21
System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +117
System.Web.UI.Page.Render(HtmlTextWriter writer) +39
System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +79
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +8753
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