Error serializing - Exception of type System.Web.HttpUnhandledException was thrown.

Solved:

You have to add [Serializable] attribute in the class and also add inherited class if you extend on that class.

Why?
Because you have created List or Dictionary type of property


Inner Exception:
System.ArgumentException: Error serializing value 'ModelClass' of type 'ModelClass.' ---> System.Runtime.Serialization.SerializationException: Type 'IMR.Model.Models.Admin.UserInOutLogSearch' in Assembly 'IMR.Model, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null' is not marked as serializable.
   at System.Runtime.Serialization.FormatterServices.InternalGetSerializableMembers(RuntimeType type)
   at System.Runtime.Serialization.FormatterServices.GetSerializableMembers(Type type, StreamingContext context)
   at System.Runtime.Serialization.Formatters.Binary.WriteObjectInfo.InitMemberInfo()
   at System.Runtime.Serialization.Formatters.Binary.WriteObjectInfo.InitSerialize(Object obj, ISurrogateSelector surrogateSelector, StreamingContext context, SerObjectInfoInit serObjectInfoInit, IFormatterConverter converter, ObjectWriter objectWriter, SerializationBinder binder)
   at System.Runtime.Serialization.Formatters.Binary.WriteObjectInfo.Serialize(Object obj, ISurrogateSelector surrogateSelector, StreamingContext context, SerObjectInfoInit serObjectInfoInit, IFormatterConverter converter, ObjectWriter objectWriter, SerializationBinder binder)
   at System.Runtime.Serialization.Formatters.Binary.ObjectWriter.Serialize(Object graph, Header[] inHeaders, __BinaryWriter serWriter, Boolean fCheck)
   at System.Runtime.Serialization.Formatters.Binary.BinaryFormatter.Serialize(Stream serializationStream, Object graph, Header[] headers, Boolean fCheck)
   at System.Runtime.Serialization.Formatters.Binary.BinaryFormatter.Serialize(Stream serializationStream, Object graph)
   at System.Web.UI.ObjectStateFormatter.SerializeValue(SerializerBinaryWriter writer, Object value)
   --- End of inner exception stack trace ---
   at System.Web.UI.ObjectStateFormatter.SerializeValue(SerializerBinaryWriter writer, Object value)
   at System.Web.UI.ObjectStateFormatter.Serialize(Stream outputStream, Object stateGraph)
   at System.Web.UI.ObjectStateFormatter.Serialize(Object stateGraph, Purpose purpose)
   at System.Web.UI.ObjectStateFormatter.System.Web.UI.IStateFormatter2.Serialize(Object state, Purpose purpose)
   at System.Web.UI.Util.SerializeWithAssert(IStateFormatter2 formatter, Object stateGraph, Purpose purpose)
   at System.Web.UI.HiddenFieldPageStatePersister.Save()
   at System.Web.UI.Page.SavePageStateToPersistenceMedium(Object state)
   at System.Web.UI.Page.SaveAllState()
   at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)

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