Problem with Debug.Assert

When I run the following code in the IDE, under the Debug configuration,
when I choose Retry on the dialogue presented by the assert, I get a message
that no source code is available for the current location.  Can anyone
enlighten me as to why VS2008 cannot see the obviously available code at
that location?

            string ns = null;
            // -- Missing code or operation to initialise ns should be here.

            // I only want to stop processing here when debugging.
            Debug.Assert(ns != null, "Whoops!  ns is null");
            if (ns == null)
            {
                Trace.WriteLine("Cannot print ns because ns is null");
            }
            else
            {
                Console.WriteLine("ns = {0}", ns);
            }




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