[ObjectDisposedException: The ObjectContext instance has been disposed and can no longer be used for operations that require a connection.]
System.Data.Entity.Core.Objects.ObjectContext.ReleaseConnection() +147
System.Data.Entity.Core.Objects.ObjectContext.ExecuteInTransaction(Func`1 func, IDbExecutionStrategy executionStrategy, Boolean startLocalTransaction, Boolean releaseConnectionOnSuccess) +529
System.Data.Entity.Core.Objects.<>c__DisplayClass3.<GetResults>b__1() +170
System.Data.Entity.SqlServer.DefaultSqlExecutionStrategy.Execute(Func`1 operation) +263
System.Data.Entity.Core.Objects.ObjectQuery`1.GetResults(Nullable`1 forMergeOption) +268
System.Data.Entity.Core.Objects.ObjectQuery`1.<System.Collections.Generic.IEnumerable<T>.GetEnumerator>b__0() +11
System.Data.Entity.Internal.LazyEnumerator`1.MoveNext() +50
System.Linq.Enumerable.Single(IEnumerable`1 source) +188
System.Linq.Queryable.Count(IQueryable`1 source) +298
DAL.NavCategoryResponsitory.GetEntities(ISpecification`1 specification, IOrderBuilder`1 sortorder, PageHelper pageHelper, Boolean getFullText) +264
Web.PublicLesson.List.GetChildHtml(Int32 categoryId) +698
Web.PublicLesson.List.BindNav(Int32 categoryId) +2255
Web.PublicLesson.List.Page_Load(Object sender, EventArgs e) +349
System.Web.UI.Control.LoadRecursive() +71
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +3178
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