Sum values in a DataTable by a given criteria

Posted by šljaker on Stack Overflow See other posts from Stack Overflow or by šljaker
Published on 2010-04-07T14:39:33Z Indexed on 2010/04/07 14:43 UTC
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c#

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datatable

Which is the most effective way to sum data in the DataTable by a given criteria?

I have the following table:

KEY_1
KEY_2,
VALUE_1,
VALUE_2

Input:

01101, P, 2, 3
01101, F, 1, 1
01101, P, 4, 4
10102, F, 5, 7

Desired output (new DataTable):

01101, P, 6, 7
01101, F, 1, 1
01101, SUM, 7, 8
10102, F, 5, 7
10102, SUM, 5, 7

I need efficient algorithm, because I have 10k rows and 18 columns in a DataTable.

Thank you.

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