I was trying to use AsEnumerable to calculate the sum of the value of the whole row, this function is not accessible. I have tried to add the System.Data.DataSetExtensions, but that does not seems to be working
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Thank you for your report. We are aware of this issue and it will be fixed in future releases.
The bug should be fixed in the latest beta versions of 20.10. Please keep in mind that this will only work for new projects, unfortunately.