Merge based on same columns in C#

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I have list like
List<account>={{1,1},{1,2},{1,3},{2,3}}

So now i want output like

list<acount>={{1,6},{2,3}}
like compare first element if it is same then add second element
so 1 was same in three then i added all with 1 and got 6

so pls help to get value like this C#

What I have tried:

I have tried for loop but it is not working as i have only one list thats why please help

Posted 14-Mar-16 21:28pm

Aviinash

Updated 14-Mar-16 22:14pm

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Patrice T 15-Mar-16 3:36am

Show code, define 'not working'

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OriginalGriff · Answer 1 · 2016-03-14T22:14:00

Try:

C#

List<KeyValuePair<int, int>> list = new List<KeyValuePair<int, int>>()
   { new KeyValuePair<int, int>(1, 1),
     new KeyValuePair<int, int>(1, 2),
     new KeyValuePair<int, int>(1, 3),
     new KeyValuePair<int, int>(2, 3)};
list = list.GroupBy(kvp => kvp.Key).Select(g => new KeyValuePair<int, int>(g.Key, (int) g.Sum(x => x.Value))).ToList();