C#: Reflection will not pick up NunIt methods with TestAttibute

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NUnit

reflection

I'm trying to run NUNIT tests through Reflection in C#. I load the assemble and get the methods, then I want to filter out for methods only assigned the NUnit.FrameWork.TestAttribute.

I have tried this and it doesn't work:

var testTypes = from t in ltAssm.GetTypes()
                       let attributes = t.GetCustomAttributes(typeof(NUnit.Framework.TestFixtureAttribute), true)
                       where attributes != null && attributes.Length > 0
                       orderby t.Name
                       select t;
       foreach (var type in testTypes)
       {
           //get test method in class.
           var testMethods = from m in type.GetMethods()
                             let attributes = m.GetCustomAttributes(typeof(NUnit.Framework.TestAttribute), true)
                             where attributes != null && attributes.Length > 0
                             orderby m.Name
                             select m;
           foreach (var method in testMethods)
           {
               methods.Add(method);
           }
       }

no methods picked up even though there are 50.

Even running this simple line doesn't pick anything up:

var xx = classMethods[11].GetCustomAttributes(typeof(NUnit.Framework.TestAttribute), false);

I also tried instantiating the type and still nothing.

Those same methods have another custom attribute which I created and assigned to them, if I attempt to retrieve the methods using that Attrib, then they are retrieved.

Anyone know of something special that needs to be done for Reflection to recognize Nunit's TestAttribute?