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ASP.NET 2.0 Basics If you are new to ASP or ASP.NET programming with version 2.0, this is the forum to begin asking questions. Please also see the Visual Web Developer 2005 forum.
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Old January 15th, 2007, 11:13 PM
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Default Object Data Source Error

Hello Guys, I'm new to this forum.

My ObjectDataSource connect to a custom class. However when I set the value of the ObjectDataSource from ListBox3.SelectedValue to ListBox3.Item(see attached pic), [img=http://img293.imageshack.us/img293/1318/errorobjectdatasourcegf4.th.jpg] I get the following error. Type 'System.Web.UI.WebControls.ListItemCollection' in Assembly 'System.Web, Version=, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' is not marked as serializable.

I googled for an answer but I couldn't find one. Initially I thought it was my web.config which is causing the problem and I tried adding the following assembly

<add assembly="System.Web, Version=, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A"/>

into my web.config but I still got the same error.

Do anyone know whats causing this error? Any help is greatly appreciated. Many thanks in advance! =)

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Old June 13th, 2007, 05:43 AM
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This means that the object you are using is not serializeble, meaning that it for instance cannot be stored in Viewstate, try to save it in sessionstate instead

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