# Contacts

## Content

A list of contacts usually includes all of the people with whom you frequently communicate. You might assign a contact to an appointment if this is the person you need to communicate with regarding the appointment. Contact information is stored in the [ContactCollection](/componentone/docs/wpf/online-scheduler/) class. Existing contacts can be retrieved from a data source, or you can add contacts to the [Contacts ](/componentone/docs/wpf/online-scheduler/)at run time. Contacts are optional, and an appointment can have one or more contacts assigned to it.

## See Also

[Add Contacts to the Contacts List](/componentone/docs/wpf/online-scheduler/Appointments/Contacts/Adding_Contacts_to_the_Contacts_List)

[Assign Contacts to an Appointment](/componentone/docs/wpf/online-scheduler/Appointments/Contacts/Assigning_Contacts_to_an_Appointment)