Another method for filtering events is to use the event subject. This is a required property that is available with all events sent through the Event Grid topic. To filter data with the subject property, we need to specify the subject's string property, which can either be a start string for a subject, an end string, or a combination of both. When configuring an Event Grid subscription, we can also use a combination of both subject and event type filtering to have granular filtered data for our interface: