[InvalidOperationException: Sequence contains no elements]
System.Data.Linq.SqlClient.SqlProvider.Execute(Expression query, QueryInfo queryInfo, IObjectReaderFactory factory, Object[] parentArgs, Object[] userArgs, ICompiledSubQuery[] subQueries, Object lastResult) +3121
System.Data.Linq.SqlClient.SqlProvider.ExecuteAll(Expression query, QueryInfo[] queryInfos, IObjectReaderFactory factory, Object[] userArguments, ICompiledSubQuery[] subQueries) +187
System.Data.Linq.SqlClient.SqlProvider.System.Data.Linq.Provider.IProvider.Execute(Expression query) +410
System.Data.Linq.DataQuery`1.System.Linq.IQueryProvider.Execute(Expression expression) +48
PQT.DAC.TourMng_BLC.RowTourCategory(Int32 p_TourCategoryID) +571
WebCus.TourBook.BindLeftTour() +97
WebCus.TourBook.Page_Load(Object sender, EventArgs e) +56
System.Web.UI.Control.OnLoad(EventArgs e) +106
System.Web.UI.Control.LoadRecursive() +68
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +3785
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