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Is a type not serializable because it is not public?

I have an open class that will not serialize correctly. When you try, the following exception is thrown:

The data contract type "MyProject.MyClass" is not serializable because it is not publicly available. A publication of this type will be fixed. In addition, you can make it internal and use the InternalsVisibleToAttribute attribute on your assembly to allow serialization of internal elements - see the documentation for more details. Keep in mind that this has certain security implications.

My class is publicly available though:

[DataContract]
public class MyClass
{
    [DataMember]
    public string Name { get; set; }

    [DataMember]
    private int Count;

    public MyClass()
    {
        Name = string.Empty;
        Count = 0;
    }
}

Why do I get this exception when the class is explicitly open?

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