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The **Expression Editor** allows you to use functions, access report bands and controls, and reference data source values in the constructed expression.
The **Expression Editor** allows you to use event argument values in the constructed expressions. Event arguments are available in the [Variables](expression-syntax.md) section.
In the **BeforePrint** event, you can use data fields from all queries in the data source.
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In the **PrintOnPage** event, data source fields are not available because data was fetched when this event occurs. You can use the event arguments that are available in the [Variables](expression-syntax.md) section.
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