Datatable Add Column Values based on row values

[ppr (Peter Preuss)]

looks like a group by on column c1
then the group members will be sum up the col values when the col values are different

[HowTo] Overview on different options for grouping data and processing the groups

This HowTo introduces on the different options for grouping data from a datatable in order to process the grouped data. Introduction Grouping data and processing the grouped data is a common scenario e.g. when the grouped data is to aggregate like summing up, find maximum, get the average or concatening items. Lets have a look on following data: [grafik] A possible scenario could be: Create a report containing following information: the region code the sum of CaseCount per RegionCode t…

checking if the group member col val is different:
grp.Select(Function (x) x(ColNameOrIndex).toString.Trim).Distinct().Count = 1