How to: Redesign Section Triggers that Calculate Percentage

On some reports that show percentages, the function that calculates the percentage is on one or more section triggers. In client report definition (RDLC) report layouts, code on section triggers is not supported. You must add a function to the report to calculate the percentage and modify fields in the Report.rdlc file so that they call the function. For example, in the standard application, report 113, Customer/Item Sales, uses the CalcPct function to calculate profit percentages.

Bron : MSDN
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