How to: Redesign SourceExpr Values in Conditionally Visible Sections

In the Classic client, you can show or hide a section of a report based on a condition. For example, section A of a report is shown only for customers that have a Customer No. value in a given range. You can show or hide a section conditionally by calling CurrReport.SHOWOUTPUT() in the OnPreSection trigger of the report.

Bron : MSDN
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