Sum and Group By using LINQ

mySectorDisbursment.ForEach(delegate (SectorDisbursment sectorDisbursment) {

                        xlWorkSheet.Cells[pieSectorColumn, 10] = sectorDisbursment.SectorName;

                        xlWorkSheet.Cells[pieSectorColumn, 11] = sectorDisbursment.AmountDisd / sectorDisbursment.NetCommit;

                        pieSectorColumn++;

                    });

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