How to do group by query using Linq

for an initial introduction have a look here:

it seems to us that you want to reach something different:

  • groupby to account no
  • calculate the net values and have the result in output

May we ask you to resharpen the requirements and share the more detailed desctription with us. Especially a rule for regulating which other col values are to take (e.g. group member first …) would be recommended as well. Thanks

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