// Create project instance and access first task and resource
System::SharedPtr<Project> project1 = System::MakeObject<Project>(dataDir + u"UpdateResourceAssignment.mpp");
System::SharedPtr<Task> task = project1->get_RootTask()->get_Children()->GetById(1);
System::SharedPtr<Resource> rsc = project1->get_Resources()->GetById(1);
        
// Create resource assignment
System::SharedPtr<ResourceAssignment> assn = project1->get_ResourceAssignments()->Add(task, rsc);
assn->Set<System::String>(Asn::Notes(), u"Newly added assignment");
        
// Save project as MPP
project1->Save(dataDir + u"UpdateResourceAssignment_out.mpp", Aspose::Tasks::Saving::SaveFileFormat::MPP);