c# - Datatable.select get rows dulicate -


i have datatable this:

code    class       math       history b       math b       math

i wanna rows have same code value class not same. expected:

a       math       history

i had tried datatable.select , group , dont work! me.

simplest way of doing via linq should like:

datatable.distinct()          .groupby(x => x.code)          .where(gr => gr.count() > 1)          .selectmany(gr=> gr);

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