Let's say that we have the common scenario of loading appointments and resources in RadScheduler. For this purpose we have three tables - Appointments, Resources and AppointmensResources. Normally, (ADO.NET) we have three TableAdapters that fill our tables with data. However, currently we should order them like this: Resources, AppointmentsResources and Appointments. Otherwise, RadScheduler will not be able to load the resources for the existing appointments. CLOSED: The AppointmentsResources table is not assigned anywhere to the scheduler so there is nothing it can notify when filled. However the table is needed in order to resolve the relations between appointments and resources. Therefore, it should be filled before the Appointments table or you can rebind the scheduler by using its DataBind method after you have filled all the tables.