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Message: [QUOTE="Gaurav Nanda, post: 3225368"] Hi, I am creating a excel plugin, where i have to create a Tree on Excel worksheet, so while saving i also want to save the tree in serialized form as a custom property of worksheet. Hence, i am using a BinaryFormatter, which serializes the Tree object and saves the result in form of a string and attach it to a cutom property of sheet.This Works fine. [Tree is comprised of nodes(NODE class, also marked serializable)], While De-serializing, it works fine , untill number of nodes in tree exceeds 24.So when N(nodes) >24 , i get two types of exceptions, any one of them randomly. 1) at System.Runtime.Serialization.ObjectManager.RegisterObject(Object obj, Int64 objectID, SerializationInfo info, Int64 idOfContainingObj, MemberInfo member, Int32[] arrayIndex) at System.Runtime.Serialization.Formatters.Binary.ObjectReader.RegisterObject(Object obj, ParseRecord pr, ParseRecord objectPr, Boolean bIsString) at System.Runtime.Serialization.Formatters.Binary.ObjectReader.ParseObjectEnd(ParseRecord pr) at System.Runtime.Serialization.Formatters.Binary.ObjectReader.Parse(ParseRecord pr) at System.Runtime.Serialization.Formatters.Binary.__BinaryParser.Run() at System.Runtime.Serialization.Formatters.Binary.ObjectReader.Deserialize(HeaderHandler handler, __BinaryParser serParser, Boolean fCheck, Boolean isCrossAppDomain, IMethodCallMessage methodCallMessage) at System.Runtime.Serialization.Formatters.Binary.BinaryFormatter.Deserialize(Stream serializationStream, HeaderHandler handler, Boolean fCheck, Boolean isCrossAppDomain, IMethodCallMessage methodCallMessage) at System.Runtime.Serialization.Formatters.Binary.BinaryFormatter.Deserialize(Stream serializationStream) at ProbTreeDemo.Connect.WorkBookOpened(Workbook myWorkBook) in C:\Docs\Visual Studio 2005\Projects\ProbTreeDemo\Connect.cs:line 286 Error Message :- An object cannot be registered twice. 2) at System.RuntimeType.CheckValue(Object value, Binder binder, CultureInfo culture, BindingFlags invokeAttr) at System.Reflection.RtFieldInfo.InternalSetValue(Object obj, Object value, BindingFlags invokeAttr, Binder binder, CultureInfo culture, Boolean doVisibilityCheck, Boolean doCheckConsistency) at System.Runtime.Serialization.FormatterServices.SerializationSetValue(MemberInfo fi, Object target, Object value) at System.Runtime.Serialization.FormatterServices.PopulateObjectMembers(Object obj, MemberInfo[] members, Object[] data) at System.Runtime.Serialization.Formatters.Binary.ReadObjectInfo.PopulateObjectMembers(Object obj, Object[] memberData) at System.Runtime.Serialization.Formatters.Binary.ObjectReader.ParseObjectEnd(ParseRecord pr) at System.Runtime.Serialization.Formatters.Binary.ObjectReader.Parse(ParseRecord pr) at System.Runtime.Serialization.Formatters.Binary.__BinaryParser.Run() at System.Runtime.Serialization.Formatters.Binary.ObjectReader.Deserialize(HeaderHandler handler, __BinaryParser serParser, Boolean fCheck, Boolean isCrossAppDomain, IMethodCallMessage methodCallMessage) at System.Runtime.Serialization.Formatters.Binary.BinaryFormatter.Deserialize(Stream serializationStream, HeaderHandler handler, Boolean fCheck, Boolean isCrossAppDomain, IMethodCallMessage methodCallMessage) at System.Runtime.Serialization.Formatters.Binary.BinaryFormatter.Deserialize(Stream serializationStream) at ProbTreeDemo.Connect.WorkBookOpened(Workbook myWorkBook) in C:\Docs\Visual Studio 2005\Projects\ProbTreeDemo\Connect.cs:line 286 Error Message:- Object of type 'ProbTreeDemo.TreeStructure.Node' cannot be converted to type 'System.Object[]'. Source is botth cases is "mscorlib". Code at line 286:- Tree temp =(Tree)bformatter.Deserialize(stream); [/QUOTE]

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