ASP.NET-MVC (IIS6) Error on high traffic: Specified cast is not valid

Question

I just launched my tiny webapp on my humble dedicated server (Win2003)... running ASP.NET MVC, LINQ2SQL, SQL Express 2005, and IIS6 (setup with wildcard mapping)

The

Answer 1

We had a similar problem with LINQ that we get "Unable to cast object of type 'System.Int32' to type 'System.String'" and "Specified cast is not valid."

Examples of stacktraces

System.InvalidCastException: Unable to cast object of type 'System.Int32' to type 'System.String'.
   at System.Data.SqlClient.SqlBuffer.get_String()
   at System.Data.SqlClient.SqlDataReader.GetString(Int32 i)
   at Read_Person(ObjectMaterializer`1 )
   at System.Data.Linq.SqlClient.ObjectReaderCompiler.ObjectReader`2.MoveNext()
   at System.Collections.Generic.List`1..ctor(IEnumerable`1 collection)
   at System.Linq.Enumerable.ToList[TSource](IEnumerable`1 source)
   at RF.Ias.Services.Person.BusinessLogic.PersonTransactionScripts.GetPersons(IEnumerable`1 personIds, Boolean includeAddress, Boolean includeContact)
   at CompositionAopProxy_5b0727341ad64f29b816c1b73d11dd44.GetPersons(IEnumerable`1 personIds, Boolean includeAddress, Boolean includeContact)
   at RF.Ias.Services.Person.ServiceImplementation.PersonService.GetPersons(GetPersonRequest request)


System.InvalidCastException: Specified cast is not valid.
   at System.Data.SqlClient.SqlBuffer.get_Int32()
   at System.Data.SqlClient.SqlDataReader.GetInt32(Int32 i)
   at Read_GetRolesForOrganisationResult(ObjectMaterializer`1 )
   at System.Data.Linq.SqlClient.ObjectReaderCompiler.ObjectReader`2.MoveNext()
   at System.Collections.Generic.List`1..ctor(IEnumerable`1 collection)
   at System.Linq.Enumerable.ToList[TSource](IEnumerable`1 source)
   at RF.Ias.Services.Role.DataAccess.RoleDataAccess.GetRolesForOrganisation(GetRolesForOrganisationCriteria criteria, Int32 pageIndex, Int32 pageSize, Int32& recordCount)
   at RF.Ias.Services.Role.BusinessLogic.RoleTransactionScripts.GetRolesForOrganisation(GetRolesForOrganisationCriteria criteria, Int32 pageIndex, Int32 pageSize, Int32& recordCount)
   at CompositionAopProxy_4bd29c6074f54d10a2c09bd4ab27ca66.GetRolesForOrganisation(GetRolesForOrganisationCriteria criteria, Int32 pageIndex, Int32 pageSize, Int32& recordCount)
   at RF.Ias.Services.Role.ServiceImplementation.RoleService.GetRolesForOrganisation(GetRolesForOrganisationRequest request)

We used to get these exceptions if we first got a exception like this "System.InvalidOperationException: There is already an open DataReader associated with this Command which must be closed first." or " A transport-level error has occurred when receiving results from the server. (provider: TCP Provider, error: 0 - An existing connection was forcibly closed by the remote host.)".

The first exception occur for a different instance of the DataCOntext then for all those that then are following.

After some research and asking in this thread , I found that the reason was that I did not dispose the DataContexts. After I started to do that, it dissappered.

Answer 2

Sounds like maybe a race condition, or perhaps a rare bug that is only correlated with high traffic because that when most of your requests occur.