ReportViewer: Grouping Data in RDLC Report
In my previous tutorial I discussed on how to create a sub report and pass a parameter value in ReportViewer.
Sub report is useful if you can’t group data to display the related record. This is true with Order-Details report. However, sub reports in RDLC seems too slow when rendering a report. As much as possible, try to avoid using sub report if it can be done using Groupings.
In this VB.NET 2010 project, you’ll see how easy it is to create Groupings to get the same output as my previous tutorial.
All you need in an RDLC report is to create a group, for example an OrderID field. It’s better to create a group using a Key or Primary Key. This is due to the fact that sometimes a “Name” field for example could create duplicate entry but actually two different instances.
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