How to detect if a Type is a generated DynamicProxy without referencing Castle DynamicProxy?

I am using castle DynamicProxy and was wondering if there is a way of detecting if a Type is a proxy without referencing Castle DynamicProxy?

So while I am using Castle DynamicProxy as an example I would like code that would work for any in memory generated type.

var generator = new ProxyGenerator();

var classProxy = generator.CreateClassProxy<Hashtable>();
Debug.WriteLine(classProxy.GetType().Is....);

var interfaceProxy = generator.CreateInterfaceProxyWithoutTarget<ICollection>();
Debug.WriteLine(interfaceProxy.GetType().Is....);

Thanks

so far i have this fugly code

    private static bool IsDynamic(Type type)
    {
        try
        {
            var location = type.Assembly.Location;
            return false;
        }
        catch (NotSupportedException)
        {
            return true;
        }
    }