I have some simple VB code that subclasses a base class from another
assembly.  The base class exposes an IDataReader via a protected field
named m_data.

When VB compiles the subclass, it has no problem accessing m_data from
it's base and executing the IDataReader methods even though the base
class is in another assembly.

Now, I am trying to duplicate the same thing using Reflection.Emit.
However, to emit IL to make calls against the field, I need to get a
reference to it.

Whenever I call GetField("m_data") it comes back as null.

I've also tried calling it with
BindingFlags.NonPublic|BindingFlags.Instance

The help states that I need to setup ReflectionPermission.  However,
the help for that class is useless.

I've tried this code which makes me think that I have both
TypeInformation and ReflectionEmit permissions.

ReflectionPermission refPerm = new
ReflectionPermission(ReflectionPermissionFlag.TypeInformation |
ReflectionPermissionFlag.ReflectionEmit);

refPerm.Assert();

Any ideas?