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Editorial Team
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Asked: 2026-05-23T04:35:55+00:00

I have a DataTable which I get by an upload of CSV document from

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I have a DataTable which I get by an upload of CSV document from the user and has columns, rows like that:

Email      Age      Team
x@x.com    25       BarcelonaFC
y@y.com    32       BesiktasJK
z@z.com    18       Napoli
y@y.com    19       Boca Juniors
x@x.com    36       Internazionale

I need to filter that datatable before I insert it into the database. Email column should be unique. So I need to filter that datatable so that I get as a result eliminating 2 rows. I do not want to use LINQ, but if it is only solution, its ok.

Email      Age      Team
x@x.com    25       BarcelonaFC
y@y.com    32       BesiktasJK
z@z.com    18       Napoli
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1 Answer

  1. Editorial Team

    You can create a HashSet<string> holding email addresses, then loop backwards through the table, add the email address for each row to the hashset, and, if it’s already there (if Add returns false), remove the row.

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