Server Error in '/' Application.

There is already an open DataReader associated with this Command which must be closed first.

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: There is already an open DataReader associated with this Command which must be closed first.

Source Error:

The source code that generated this unhandled exception can only be shown when compiled in debug mode. To enable this, please follow one of the below steps, then request the URL:

1. Add a "Debug=true" directive at the top of the file that generated the error. Example:

  <%@ Page Language="C#" Debug="true" %>

or:

2) Add the following section to the configuration file of your application:

<configuration>
   <system.web>
       <compilation debug="true"/>
   </system.web>
</configuration>

Note that this second technique will cause all files within a given application to be compiled in debug mode. The first technique will cause only that particular file to be compiled in debug mode.

Important: Running applications in debug mode does incur a memory/performance overhead. You should make sure that an application has debugging disabled before deploying into production scenario.

Stack Trace:


[InvalidOperationException: There is already an open DataReader associated with this Command which must be closed first.]
   System.Data.SqlClient.SqlInternalConnectionTds.ValidateConnectionForExecute(SqlCommand command) +1733354
   System.Data.SqlClient.SqlCommand.ValidateCommand(String method, Boolean async) +314
   System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method, TaskCompletionSource`1 completion, Int32 timeout, Task& task, Boolean& usedCache, Boolean asyncWrite, Boolean inRetry) +156
   System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method) +84
   System.Data.SqlClient.SqlCommand.ExecuteReader(CommandBehavior behavior, String method) +207
   System.Data.Linq.SqlClient.SqlProvider.Execute(Expression query, QueryInfo queryInfo, IObjectReaderFactory factory, Object[] parentArgs, Object[] userArgs, ICompiledSubQuery[] subQueries, Object lastResult) +1732
   System.Data.Linq.SqlClient.SqlProvider.ExecuteAll(Expression query, QueryInfo[] queryInfos, IObjectReaderFactory factory, Object[] userArguments, ICompiledSubQuery[] subQueries) +189
   System.Data.Linq.SqlClient.CompiledQuery.Execute(IProvider provider, Object[] arguments) +139
   System.Data.Linq.DeferredSourceFactory`1.ExecuteKeyQuery(Object[] keyValues) +546
   System.Data.Linq.DeferredSourceFactory`1.Execute(Object instance) +966
   System.Data.Linq.EntitySet`1.Load() +167
   System.Data.Linq.EntitySet`1.GetEnumerator() +23
   System.Linq.Enumerable.SingleOrDefault(IEnumerable`1 source, Func`2 predicate) +108
   FindRestaurants2.<getRests>b__21(Restaurant a) +18
   System.Linq.EnumerableSorter`2.ComputeKeys(TElement[] elements, Int32 count) +114
   System.Linq.EnumerableSorter`1.Sort(TElement[] elements, Int32 count) +29
   System.Linq.<GetEnumerator>d__1.MoveNext() +273
   System.Linq.<SelectManyIterator>d__17`2.MoveNext() +445
   System.Linq.<DistinctIterator>d__64`1.MoveNext() +480
   System.Linq.WhereSelectEnumerableIterator`2.MoveNext() +123
   System.Linq.<DistinctIterator>d__64`1.MoveNext() +480
   FindRestaurants2.getRests(String orderBy) +14758
   FindRestaurants2.RadListView1_NeedDataSource(Object sender, RadListViewNeedDataSourceEventArgs e) +96
   Telerik.Web.UI.RadListView.OnNeedDataSource(RadListViewNeedDataSourceEventArgs e) +147
   Telerik.Web.UI.RadListView.ObtainDataSource(RadListViewRebindReason rebindReason, Boolean isBoundUsingDataSourceId) +107
   Telerik.Web.UI.RadListView.AutoDataBind(RadListViewRebindReason rebindReason) +79
   FindRestaurants2.Page_Load(Object sender, EventArgs e) +1428
   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:4.8.4700.0