mono_domain_assembly_open(domain, "C:/monoass.dll");

mono_class_from_name(mono_assembly_get_image(ass), "monoass", "MainClass"); // where "monoass" is the name of namespace

void* iter = NULL;
MonoMethod* method;
while(method = mono_class_get_methods(mono_class, &iter))
{
    cout << mono_method_full_name(method, 1);
}