What does this SerializationException means

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I am saving a treeview to an xml file then i got this error, the xml saves but Im still bothered about this error so can anyone tell me what this means? thank you :)

Type 'System.Web.UI.WebControls.TreeNode' in Assembly 'System.Web, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' is not marked as serializable.
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.Runtime.Serialization.SerializationException: Type 'System.Web.UI.WebControls.TreeNode' in Assembly 'System.Web, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' is not marked as serializable.

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.TreeNode' 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) +9476053
   System.Runtime.Serialization.FormatterServices.GetSerializableMembers(Type type, StreamingContext context) +247
   System.Runtime.Serialization.Formatters.Binary.WriteObjectInfo.InitMemberInfo() +160
   System.Runtime.Serialization.Formatters.Binary.WriteObjectInfo.InitSerialize(Object obj, ISurrogateSelector surrogateSelector, StreamingContext context, SerObjectInfoInit serObjectInfoInit, IFormatterConverter converter, ObjectWriter objectWriter, SerializationBinder binder) +491
   System.Runtime.Serialization.Formatters.Binary.WriteObjectInfo.Serialize(Object obj, ISurrogateSelector surrogateSelector, StreamingContext context, SerObjectInfoInit serObjectInfoInit, IFormatterConverter converter, ObjectWriter objectWriter, SerializationBinder binder) +54
   System.Runtime.Serialization.Formatters.Binary.ObjectWriter.Serialize(Object graph, Header[] inHeaders, __BinaryWriter serWriter, Boolean fCheck) +542
   System.Runtime.Serialization.Formatters.Binary.BinaryFormatter.Serialize(Stream serializationStream, Object graph, Header[] headers, Boolean fCheck) +133
   System.Runtime.Serialization.Formatters.Binary.BinaryFormatter.Serialize(Stream serializationStream, Object graph) +13
   System.Web.UI.ObjectStateFormatter.SerializeValue(SerializerBinaryWriter writer, Object value) +3113

[ArgumentException: Error serializing value 'System.Web.UI.WebControls.TreeNode' of type 'System.Web.UI.WebControls.TreeNode.']
   System.Web.UI.ObjectStateFormatter.SerializeValue(SerializerBinaryWriter writer, Object value) +3428
   System.Web.UI.ObjectStateFormatter.Serialize(Stream outputStream, Object stateGraph) +141
   System.Web.UI.ObjectStateFormatter.Serialize(Object stateGraph) +57
   System.Web.UI.ObjectStateFormatter.System.Web.UI.IStateFormatter.Serialize(Object state) +4
   System.Web.UI.Util.SerializeWithAssert(IStateFormatter formatter, Object stateGraph) +37
   System.Web.UI.HiddenFieldPageStatePersister.Save() +79
   System.Web.UI.Page.SavePageStateToPersistenceMedium(Object state) +108
   System.Web.UI.Page.SaveAllState() +315
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +2839

Posted 15-Jan-14 14:03pm

Goenitz

Updated 15-Jan-14 14:08pm

v2

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JoCodes 15-Jan-14 23:22pm

Posting your code which throws this error will make it easy for helping you

Member 15090208 5-Mar-21 2:15am

Type 'System.Web.UI.WebControls.Table' in Assembly 'System.Web, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' is not marked as serializable.
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.Runtime.Serialization.SerializationException: Type 'System.Web.UI.WebControls.Table' in Assembly 'System.Web, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' is not marked as serializable.

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.

I Was getting error when I tried to do
ViewState["rolesTable"] = DyanmicTable; // Dynamictable is asp table name

2 solutions

Solution 2

As rightly stated by Ron Beyer Treeview or Treeview Node types are not serializable controls. So if you try to persist the state such as ViewState and Save it it throws exception.

If you really intend to persist the states use some other approaches as below

Using Serialization to Persist TreeView Control (VB.NET)[^]

How to Serialize a TreeNode Object[^]

Hope this helps...

Posted 15-Jan-14 17:21pm

JoCodes

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Ron Beyer · Accepted Answer · 2014-01-15T14:08:00

Solution 1

It means you are storing a tree node in your page state, and when you try to save the state it serializes it. Since tree nodes are not serializable, you get an exception.

You need to remove the tree node from your page state before saving it.

Posted 15-Jan-14 14:08pm

Ron Beyer

Comments

Goenitz 15-Jan-14 22:51pm

so you mean i have to make it nothing?

Ron Beyer 15-Jan-14 22:52pm

I can't see the code for your page, so I really can't tell you how to remove it from the page state. If you improve your question with the code, I can probably give you some better advice.

Goenitz 16-Jan-14 0:29am

I got it, thank you Sir Ron Beyer :)