C1Scheduler allows you to customize your data model for those situations in which you need to associate more data fields to each appointment. This also allows you to attach custom Business Objects to each appointment. You can use the CustomData property if you need a few additional data fields that can be saved as text. The Tag property allows you to associate a business object with each appointment but not serialize it with each appointment. In this tutorial, you will create an application that consists of three parts: the MainPage.xaml file, a custom EditAppointmentDialog.xaml file that contains the custom appointments dialog, and a BusinessObjects.cs or BusinessObjects.vb file that defines your business objects classes.