Error - is not marked as serializable

Question

The error I m getting is   Type  OrgPermission  in Assembly  App Code ptjvczom  Version 0 0 0 0  Culture neutral  PublicKeyToken null  is not marked as serializable     here is my code   I have a gridview  that uses the following DataSource     lt asp ObjectDataSource ID  ObjectDataSource1  runat  server  SelectMethod  GetOrgList               TypeName  Org  gt       lt SelectParameters gt         lt asp SessionParameter Name  orgCodes  SessionField  UserOrgs  Type  Object    gt          lt asp Parameter DefaultValue  Y  Name  active  Type  String    gt       lt  SelectParameters gt    lt  asp ObjectDataSource gt    I set the session variable in my page load like so   User cUser   new User userid     make sure the user is an Admin List lt OrgPermission gt  orgs   new List lt OrgPermission gt     foreach OrgPermission org in cUser orgs            if  org type   admin                  orgs Add org                                      Session  UserOrgs     orgs    My user class looks like this   public class OrgPermission       public string Org   get  set           public List lt string gt  type   get  set         public OrgPermission                 public class cUser           public string userid   get  set        public List lt OrgPermission gt  orgs   get  set         public clsUser string username                i set everything here           I can t understand why it s breaking  can I use it without making it serializable   I tried to debug  and the session variable sets just fine  it then goes into the GetOrgList and returned correct results  but the page does not load and I get the error above   Here is a snippet of my GetOrgList function   public DataTable GetOrgList List lt OrgPermission gt  orgCodes  string active                 string orgList   null             code to set OrgList using the parameter is here           DataSet ds   new DataSet            SqlConnection conn   new SqlConnection cCon getConn             SqlCommand cmd   new SqlCommand  sp GetOrgList   conn           cmd CommandType   CommandType StoredProcedure          cmd Parameters Add new SqlParameter   orgList   orgList            cmd Parameters Add new SqlParameter   active   active                 conn Open                SqlDataAdapter sqlDA   new SqlDataAdapter                 sqlDA SelectCommand   cmd              sqlDA Fill ds                conn Close            return ds Tables 0

User · Accepted Answer

You need to add a Serializable attribute to the class which you want to serialize    Serializable  public class OrgPermission

User · Answer

If you store an object in session state  that object must be serializable   http   www hpenterprisesecurity com vulncat en vulncat dotnet asp dotnet bad practices non serializable object stored in session html    edit     In order for the session to be serialized correctly  all objects the application stores as session attributes must declare the  Serializable  attribute  Additionally  if the object requires custom serialization methods  it must also implement the ISerializable interface   https   vulncat hpefod com en detail id desc structural dotnet asp dotnet bad practices non serializable object stored in session C 23 2fVB NET 2fASP NET

User · Answer

Leaving my specific solution of this for prosperity  as it s a tricky version of this problem    Type  System Linq Enumerable WhereSelectArrayIterator T     was not marked as serializable  Due to a class with an attribute IEnumerable lt int gt  eg     Serializable  class MySessionData      public int ID      public IEnumerable lt int gt  RelatedIDs    This can be an issue     Originally the problem instance of MySessionData was set from a non-serializable list    MySessionData instance   new MySessionData         ID   123      RelatedIDs   nonSerizableList Select lt int gt  item   gt  item ID       The cause here is the concrete class that the Select lt int gt       returns  has type data that s not serializable  and you need to copy the id s to a fresh List lt int gt  to resolve it    RelatedIDs   nonSerizableList Select lt int gt  item   gt  item ID  ToList

[c#] Error - is not marked as serializable

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