Rule: If-Then-Else
To condition the behavior of a control, use the If-Then-Else rule.
The If-Then-Else rule consists of:
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the condition(s) to check (the If statement)
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what happens if the condition is true (the Then statement)
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what happens if the condition is false (the Else statement)

The If Statement
Use the Expression editor
to define a condition query.
You can compare two values, or group multiple comparisons by using the And or Or operators.
The Then/Else Statements
You can insert any other rule in the Then and Else statements.