sorry for being late,
The stack trace of the exception is:

System.SystemException was caught
  Message=Timeout expired.
  Source=OpenLink.Data.Virtuoso
  StackTrace:
       at OpenLink.Data.Virtuoso.Future.GetResult(ISession session,
FutureList futures, Boolean remove)
       at OpenLink.Data.Virtuoso.Future.GetNextResult(ISession session,
FutureList futures)
       at OpenLink.Data.Virtuoso.ManagedCommand.ProcessResult(Boolean
needEvl)
       at OpenLink.Data.Virtuoso.ManagedCommand.Execute(String query)
       at
OpenLink.Data.Virtuoso.VirtuosoCommand.ExecuteReader(CommandBehavior
behavior)
       at
OpenLink.Data.Virtuoso.VirtuosoCommand.ExecuteDbDataReader(CommandBehavior
behavior)
       at
System.Data.Common.DbCommand.System.Data.IDbCommand.ExecuteReader(CommandBehavior
behavior)
       at System.Data.Common.DbDataAdapter.FillInternal(DataSet dataset,
DataTable[] datatables, Int32 startRecord, Int32 maxRecords, String
srcTable, IDbCommand command, CommandBehavior behavior)
       at System.Data.Common.DbDataAdapter.Fill(DataTable[] dataTables,
Int32 startRecord, Int32 maxRecords, IDbCommand command, CommandBehavior
behavior)
       at System.Data.Common.DbDataAdapter.Fill(DataTable dataTable)
       at VDS.RDF.Storage.VirtuosoManager.Query(IRdfHandler rdfHandler,
ISparqlResultsHandler resultsHandler, String sparqlQuery)
       at VDS.RDF.Storage.VirtuosoManager.Query(String sparqlQuery)
       at relAlgorithm.QueryProcessor.doQuery(String queryText) in
C:\Users\Sherif\Dropbox\Graduation project
-Sherif\[Prototype]\relalgorithm-lt\relAlgorithm\relAlgorithm\QueryProcessor.cs:line
138
  InnerException:

I know for sure it times out after 30 seconds because I made a timer to
count the time from sending the query to the catch{} , it displayed 30.xxxx
seconds

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