When bundled with ASP.Net BundleConfig, the rowGroup extension is inoperative.
When bundled with ASP.Net BundleConfig, the rowGroup extension is inoperative.

The nuget package for datatables 1.10.15 has an empty dataTables.rowGroup.min.js file.
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Answers
1.10.15 is old. 1.12.1 is the current release. RowGroup has its own Nuget: https://www.nuget.org/packages/datatables.net-rowgroup/
Allan