How can I remove duplicate data in datatable with using condition in columns

[ppr (Peter Preuss)]

With group By we can identify the rows belonging to a person
From the group we can extract the Entry Date / Expire Date from the group members

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[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…