Weird random exceptions

[Rixoxs]

Related to ASP.NET MVC + LINQ exceptionI get 2 exceptions at a random of 8-12 page reloads - which of the exceptions is also random, it could be number one, it could be number two. The exceptions are the following\[code\][IndexOutOfRangeException: Index was outside the bounds of the array.] System.Data.SqlClient.SqlDataReader.ReadColumnHeader(Int32 i) +701 System.Data.SqlClient.SqlDataReader.IsDBNull(Int32 i) +29 Read_BoardMessage(ObjectMaterializer`1 ) +348 System.Data.Linq.SqlClient.ObjectReader`2.MoveNext() +42 System.Collections.Generic.List`1..ctor(IEnumerable`1 collection) +472 System.Linq.Enumerable.ToList(IEnumerable`1 source) +80 Website.BusinessLogic.Services.BoardMessageService.GetBoardMessageModelsFromQuery(IQueryable`1 boardMessagesQuery) in D:\Applications\Alinea\Samfundsfag\Website.BusinessLogic\Services\BoardMessageService.cs:167 Website.BusinessLogic.Services.<>c__DisplayClass6.<GetStudentsBoardMessages>b__5() in D:\Applications\Website.BusinessLogic\Services\BoardMessageService.cs:89 Library.Web.Utilities.RequestScopeCache.Get(String key, Func`1 defaultGetter) in D:\APPLICATIONS\Library\Web\Utilities\RequestScopeCache.cs:66 Website.BusinessLogic.Services.BoardMessageService.GetStudentsBoardMessages(Int32 classId) in D:\Applications\Website.BusinessLogic\Services\BoardMessageService.cs:89 Website.Web.usercontrols.ShowMessages.Initialize() in D:\Applications\Website.Web\usercontrols\ShowMessages.ascx.cs:28 System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e) +25 System.Web.UI.Control.LoadRecursive() +71 System.Web.UI.Control.LoadRecursive() +190 System.Web.UI.Control.LoadRecursive() +190 System.Web.UI.Control.LoadRecursive() +190 System.Web.UI.Control.LoadRecursive() +190 System.Web.UI.Control.LoadRecursive() +190 System.Web.UI.Control.LoadRecursive() +190 System.Web.UI.Control.LoadRecursive() +190 System.Web.UI.Control.LoadRecursive() +190 System.Web.UI.Control.LoadRecursive() +190 System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +3064\[/code\]----- and -----\[code\][InvalidOperationException: Sequence contains more than one element] System.Data.Linq.SqlClient.SqlProvider.Execute(Expression query, QueryInfo queryInfo, IObjectReaderFactory factory, Object[] parentArgs, Object[] userArgs, ICompiledSubQuery[] subQueries, Object lastResult) +4539 System.Data.Linq.SqlClient.SqlProvider.ExecuteAll(Expression query, QueryInfo[] queryInfos, IObjectReaderFactory factory, Object[] userArguments, ICompiledSubQuery[] subQueries) +207 System.Data.Linq.SqlClient.SqlProvider.System.Data.Linq.Provider.IProvider.Execute(Expression query) +500 System.Data.Linq.DataQuery`1.System.Linq.IQueryProvider.Execute(Expression expression) +41 System.Linq.Queryable.Count(IQueryable`1 source) +352 Website.Web.usercontrols.TopMenu.SetStudentMenu() in D:\Applications\Website.Web\usercontrols\TopMenu.ascx.cs:93 Website.Web.usercontrols.TopMenu.IsLoggedIn() in D:\Applications\Website.Web\usercontrols\TopMenu.ascx.cs:60 System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e) +25 System.Web.UI.Control.LoadRecursive() +71 System.Web.UI.Control.LoadRecursive() +190 System.Web.UI.Control.LoadRecursive() +190 System.Web.UI.Control.LoadRecursive() +190 System.Web.UI.Control.LoadRecursive() +190 System.Web.UI.Control.LoadRecursive() +190 System.Web.UI.Control.LoadRecursive() +190 System.Web.UI.Control.LoadRecursive() +190 System.Web.UI.Control.LoadRecursive() +190 System.Web.UI.Control.LoadRecursive() +190 System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +3064\[/code\]The stack trace points to the following code\[code\]using (var dataContext = new MyDataContext(Config.ConnectionString)){ int numberOfBoardMessages = dataContext.BoardMessages. Where(boardMessage => boardMessage.BoardMessageClasses. Any(boardMessageClass => boardMessageClass.ClassId == currentClassId) && boardMessage.IsPublished). Count();}\[/code\]I have tried with a blank database with no 'BoardMessages' and the error still occurs. Does anyone have any ideas to what might be the problem?