unable to serialize session state

Question

Server Error in '/' Application.

Unable to serialize the session state. In 'StateServer' and 'SQLServer' mode, ASP.NET will serialize the session state objects, and as a result non-serializable objects or MarshalByRef objects are not permitted. The same restriction applies if similar serialization is done by the custom session state store in 'Custom' mode.

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.Web.HttpException: Unable to serialize the session state. In 'StateServer' and 'SQLServer' mode, ASP.NET will serialize the session state objects, and as a result non-serializable objects or MarshalByRef objects are not permitted. The same restriction applies if similar serialization is done by the custom session state store in 'Custom' mode.

Source Error:

  An unhandled exception was generated during the execution of the current  web request. Information regarding the origin and location of the  exception can be identified using the exception stack trace below.

Stack Trace:

[SerializationException: Type 'System.Web.HttpPostedFile' in Assembly 'System.Web, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' is not marked as serializable.]    System.Runtime.Serialization.FormatterServices.InternalGetSerializableMembers(RuntimeType type) +10751795    System.Runtime.Serialization.FormatterServices.GetSerializableMembers(Type type, StreamingContext context) +230    System.Runtime.Serialization.Formatters.Binary.WriteObjectInfo.InitMemberInfo() +121    System.Runtime.Serialization.Formatters.Binary.WriteObjectInfo.InitSerialize(Object obj, ISurrogateSelector surrogateSelector, StreamingContext context, SerObjectInfoInit serObjectInfoInit, IFormatterConverter converter, ObjectWriter objectWriter, SerializationBinder binder) +182    System.Runtime.Serialization.Formatters.Binary.WriteObjectInfo.Serialize(Object obj, ISurrogateSelector surrogateSelector, StreamingContext context, SerObjectInfoInit serObjectInfoInit, IFormatterConverter converter, ObjectWriter objectWriter, SerializationBinder binder) +51    System.Runtime.Serialization.Formatters.Binary.ObjectWriter.Serialize(Object graph, Header[] inHeaders, __BinaryWriter serWriter, Boolean fCheck) +540    System.Runtime.Serialization.Formatters.Binary.BinaryFormatter.Serialize(Stream serializationStream, Object graph, Header[] headers, Boolean fCheck) +131    System.Web.Util.AltSerialization.WriteValueToStream(Object value, BinaryWriter writer) +1666  [HttpException (0x80004005): Unable to serialize the session state. In 'StateServer' and 'SQLServer' mode, ASP.NET will serialize the session state objects, and as a result non-serializable objects or MarshalByRef objects are not permitted. The same restriction applies if similar serialization is done by the custom session state store in 'Custom' mode.]    System.Web.Util.AltSerialization.WriteValueToStream(Object value, BinaryWriter writer) +1754    System.Web.SessionState.SessionStateItemCollection.WriteValueToStreamWithAssert(Object value, BinaryWriter writer) +34    System.Web.SessionState.SessionStateItemCollection.Serialize(BinaryWriter writer) +628    System.Web.SessionState.SessionStateUtility.Serialize(SessionStateStoreData item, Stream stream) +240    System.Web.SessionState.SessionStateUtility.SerializeStoreData(SessionStateStoreData item, Int32 initialStreamSize, Byte[]& buf, Int32& length, Boolean compressionEnabled) +62    System.Web.SessionState.OutOfProcSessionStateStore.SetAndReleaseItemExclusive(HttpContext context, String id, SessionStateStoreData item, Object lockId, Boolean newItem) +111    System.Web.SessionState.SessionStateModule.OnReleaseState(Object source, EventArgs eventArgs) +565    System.Web.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +136    System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +69

this error is occured when i am uploading doc file.

Nilesh Shah · Answer

The error reads: Type 'System.Web.HttpPostedFile' in Assembly 'System.Web Version=4.0.0.0 Culture=neutral PublicKeyToken=b03f5f7f11d50a3a' is not marked as serializable.] This means that you are having a property of type HttpPostedFile somewhere in some class which you are storing in session. As the HttpPostedFile class is from system assembly you cannot make any change to it. I suggest you change your class to remove HttpPostedFile property.

Nilesh Shah · Answer

Hi Chandu good to know your issue was resolved. Can I ask you to mark the answer which resolved your issue as accepted answer? If it was my answer or anyone else's answer. Please always follow this practice of marking correct answer as accepted answer

chandu bada · Answer

Hi Nilesh thanks for your reply. issue was resolved.

Mangesh Gaherwar · Answer

Ok so it was something with HttpPostedFiles then all right so error message has hinted the things for us then :)

chandu bada · Answer

I just cleared the store which contains upload files.

Mangesh Gaherwar · Answer

Good to hear Can u post how did u solve this Might help others thanks

chandu bada · Answer

Thanks for your reply Mangesh and Srivastava My Issue has been resolved.

chandu bada · Answer

hiii srivastava i can't send code my code is about 3gb size and sending is violating comapany rules. i can send class files which are causing this error.

Bikesh Srivastava · Answer

I think you want serilize session object but we are not able to find reason of error so can you share your code.????

chandu bada · Answer

no bro i dont have that in my code and i am not serializing.

chandu bada · Answer

Iserializable is not supporting for that interface.

Mangesh Gaherwar · Answer

System.Web.HttpPostedFile are u serializing this chandu?

Mangesh Gaherwar · Answer

BaseLanguage is serializable right here? try ISerlializable implementing this Interface Once

chandu bada · Answer

I can't send the sample code that is violating company rules so that'y i sent few lines of code. except adding serialize attribute to class do you have another solution?

Mangesh Gaherwar · Answer

Chandu can u share the sample code u using please i am unabel to get the things from the class u shared

chandu bada · Answer

Hii Mangesh Already I tried with that but it didn't work. Thanks for your reply here is my code namespace Kolme.Entities.TimeSheet { [Serializable] [DataContract] public partial class Project : BaseLanguage { [DataMember] [Browsable(false)] public Guid ProjectId { get; set; } [DataMember] public string ProjectCode { get; set; }

Mangesh Gaherwar · Answer

Hey chandu is Ur class serializable please try to add the [Serializable] to the class..