Group By Having Count > 1 in Linq -

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• linq group having count 2 answers

i have following data

date          | projecttypeid --------------  ------------- 10/31/2016    |     1 11/30/2016    |     2 12/31/2016    |     2 01/01/2016    |     3 

what linq query dates projecttypeids has dates count > 1

results should yield me following list of dates because projecttypeid = 2 has 2 dates associated it

11/30/2016 12/31/2016 

something like:

var result = data.groupby(item => item.projecttypeid, item => item.date)                  .where(group => group.count() > 1)                  .selectmany(group => group)                  .tolist();