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Server Eroor in C#.Net?

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.UI.WebControls.Table' in Assembly 'System.Web, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' is not marked as serializable.]
   System.Runtime.Serialization.FormatterServices.InternalGetSerializableMembers(RuntimeType type) +10556108
   System.Runtime.Serialization.FormatterServices.GetSerializableMembers(Type type, StreamingContext context) +305
   System.Runtime.Serialization.Formatters.Binary.WriteObjectInfo.InitMemberInfo() +187
   System.Runtime.Serialization.Formatters.Binary.WriteObjectInfo.InitSerialize(Object obj, ISurrogateSelector surrogateSelector, StreamingContext context, SerObjectInfoInit serObjectInfoInit, IFormatterConverter converter, ObjectWriter objectWriter) +243
   System.Runtime.Serialization.Formatters.Binary.ObjectWriter.Serialize(Object graph, Header[] inHeaders, __BinaryWriter serWriter, Boolean fCheck) +1115
   System.Runtime.Serialization.Formatters.Binary.BinaryFormatter.Serialize(Stream serializationStream, Object graph, Header[] headers, Boolean fCheck) +231
   System.Web.Util.AltSerialization.WriteValueToStream(Object value, BinaryWriter writer) +2049

[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) +1717053
   System.Web.SessionState.SessionStateItemCollection.WriteValueToStreamWithAssert(Object value, BinaryWriter writer) +49
   System.Web.SessionState.SessionStateItemCollection.Serialize(BinaryWriter writer) +745
   System.Web.SessionState.SessionStateUtility.Serialize(SessionStateStoreData item, Stream stream) +258
   System.Web.SessionState.SessionStateUtility.SerializeStoreData(SessionStateStoreData item, Int32 initialStreamSize, Byte[]& buf, Int32& length) +80
   System.Web.SessionState.SqlSessionStateStore.SetAndReleaseItemExclusive(HttpContext context, String id, SessionStateStoreData item, Object lockId, Boolean newItem) +2993813
   System.Web.SessionState.SessionStateModule.OnReleaseState(Object source, EventArgs eventArgs) +775
   System.Web.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +80
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +171


Version Information:
Microsoft .NET Framework Version:2.0.50727.5448; ASP.NET Version:2.0.50727.5420


Answer:


The exception is self explanatory. As per the exception you are using Table class to store in Session and session mode might be either StateServer or SQLServer. In both session modes we have to use only  serializable class to store in session. Serializable class means class marked/decorated with Serilizable attribute. 

You can not use Asp.net Table in Session as it is not a serializable class. Create your own custom class and mark it with Serializable attribute and store it in session. 

and Check your configuration settings  to set session state Some thing like InProc, SqlServer etc...

References:

http://dotnetguts.blogspot.com/2009/06/steps-for-session-inproc-mode-to.html


-- 

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