I am trying to use DataContractSerialization on WPF and WP7. All things are good on WPF but not on WP7. When I tryed to serialize an object on wp7, I received an unknown security exception. Please view the attached source code and help me.

Thanks.
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I had the same issue.
In my scenario, I was trying to serialize a nested class.
I had to remove the nesting and define the class as public, and then it worked.