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    <p>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."</p> <p>Examples of stacktraces</p> <pre><code>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&amp; recordCount) at RF.Ias.Services.Role.BusinessLogic.RoleTransactionScripts.GetRolesForOrganisation(GetRolesForOrganisationCriteria criteria, Int32 pageIndex, Int32 pageSize, Int32&amp; recordCount) at CompositionAopProxy_4bd29c6074f54d10a2c09bd4ab27ca66.GetRolesForOrganisation(GetRolesForOrganisationCriteria criteria, Int32 pageIndex, Int32 pageSize, Int32&amp; recordCount) at RF.Ias.Services.Role.ServiceImplementation.RoleService.GetRolesForOrganisation(GetRolesForOrganisationRequest request) </code></pre> <p>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.)".</p> <p>The first exception occur for a different instance of the DataCOntext then for all those that then are following.</p> <p>After some research and asking in this <a href="https://stackoverflow.com/questions/780447/is-it-possible-to-gets-sql-connection-leaks-using-linq/780669#780669">thread</a> , I found that the reason was that I did not dispose the DataContexts. After I started to do that, it dissappered.</p>
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    1. COAre you disposing your datacontext before creating a new instance?
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    2. COThank you. I had similar issues and this fixed me up.
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