Help adding rows to each other in data table

[ppr (Peter Preuss)]

we can do it with the help of a group by

prepare the report table with build datatable (configure two or needed coumns)
OR
Assign activity
LHS: dtReport | datatable
RHS: YourOriginDataTable.Clon

then use again an assign Activity
LHS: dtReport
RHS:

(From d in YourOriginDataTable.asEnumerable
Group d by k=d(0).toString.Trim into grp=Group
Let s = grp.Sum(Function (x) CInt(x(1).toString.Trim))
Let ra = new Object(){k,s}
Select r=dtReport.Rows.Add(ra)).CopyToDataTable

Also have a look here:

[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…