Error on postback after adding ViewState

After adding the line ViewState["CachedControls"] = data to my property, I now receive this error on a postback:

"A Runtime Error has occurred.
Do you wish to Debug?
Line: 4723
Error: Sys.WebForms.PageRequestManagerServerErrorException: Error serializing value 'System.Collections.Generic.List`1[System.Collections.IEnumerable]' of type 'System.Collections.Generic.List`1[[System.Collections.IEnumerable, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089]].'"

I have Script Manager and UpdatePanel controls on the page, and it breaks into generated JavaScript code within an onReadyStateChange event.  The call stack is extremely unhelpful in this matter.
private List<IEnumerable> ControlData
{
	get 
	{
		List<IEnumerable> data =(List<IEnumerable>)ViewState["CachedControls"];
		if (data == null)
		{
			EditController editControl = new EditController(SearchType); 
			data = editControl.GetData();
			ViewState["CachedControls"] = data;
		}
 
		return data; 
	}
}

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PerlChaserAsked:
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JunkManCommented:
what exactly is .getData() returning, one of the IEnumerable's returned is not marked a Serializable

like so:
[Serializable]
public class foo:IEnumerable{
 
}

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PerlChaserAuthor Commented:
I will get back to you on this tomorrow, I need to head home.

PerlChaser
0
PerlChaserAuthor Commented:
GetData returns an IEnumerable list containing:
1. Dictionary<string, string>
2. IEnumerable<Term>
Term is marked Serializable.
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JunkManCommented:
I vaguely remember having issues when serializing dictonaries. Could you trim the getData method to return either one or the other type? that way you will know exactly which one is causing you the problem.

Also double check if Term is not referring to any object that might not be serializable.
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PerlChaserAuthor Commented:
Yes, serializing this object was the problem.  I chose to store just the Dictionary in the ViewState since that was the only piece I needed between calls.  Thank you very much for your help, JunkMan.
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