error in user control why?

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Type '<>f__AnonymousTypee`3[[System.Int64, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089],[System.String, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089],[System.String, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089]]' in Assembly 'App_Web_4prx32q4, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null' is not marked as serializable.

This is my code of user control .In first Line if (ViewState[_lstDataSource"] == null)
it generates the above error why??

C#

protected void Page_Load(object sender, EventArgs e)
 {
     try
     {

         if (ViewState[_lstDataSource"] == null)
             ViewState[_lstDataSource"] = null;

     }
     catch (Exception ex)
     {
         throw ex;
     }

 }
 public IEnumerable<Object> getDataSource
 {
     get
     {
         return (IEnumerable<Object>)(ViewState["_lstDataSource"]);
     }
     set
     {
         ViewState["_lstDataSource"] = value.ToList();

     }
 }

I called this user control in my .aspx page

C#

btnExport.getDataSource =query;
               btnExport.Export(query);

Posted 15-Jun-14 19:56pm

Neha Mukesh

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Manoj B. Kalla 16-Jun-14 2:04am

Can you show me your asp.net code also.

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DamithSL · Answer 1 · 2014-06-15T20:02:00

add below attributes to your property

C#

[Browsable(false)]
[EditorBrowsable(EditorBrowsableState.Never)]
[DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
public IEnumerable<object> getDataSource
{
    get
    {
       return (IEnumerable<object>)(ViewState["_lstDataSource"]);
    }
    set
    {
       ViewState["_lstDataSource"] = value.ToList();
    
    }
}

Bernhard Hiller · Answer 2 · 2014-06-15T20:17:00

1. That's a totally wrong code:

C#

try
{

    if (ViewState[_lstDataSource"] == null)
        ViewState[_lstDataSource"] = null;

}
catch (Exception ex)
{
    throw ex;
}

Why? If ViewState["_lstDataSource"] is already null, there is no need to set it to null. And a catch (Exception ex) { throw ex; } without anything else just destroys the callstack information of the original exception, it does not add any information or offer any help.

2. The source fo your problem is somewhere else. Where is the type of _lstDataSource defined? There you have to add an attribute, something like

C#

[Serializable]
public class SomeType

error in user control why?

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