Need a help on Group By

[ppr (Peter Preuss)]

@Marian_B

Dt.AsEnumerable().GroupBy(Function(i) i.Field(Of String)(“Col1”)).Select(Function(g) g.First).CopyToDataTable

(From d in dtData.AsEnumerable
Group d by k1=d(YourColNameOrIndex).toString.Trim, k2=d(YourColNameOrIndex).toString.Trim intogrp=Group
Select r = grp.First()).CopyToDataTable

[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…