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112

answers:

2
+3  A: 
var groups = keys.GroupBy(e=>e.Split(':').Last());
Mehrdad Afshari
A: 

Thank you very very much Mehrdad Afshari.

Is there any nice article series about lambda expression that you know ?

Barbaros Alp
This should be a comment. No, I don't remember a special article about it. I think in that case, Google will help you better.
Mehrdad Afshari
Sorry, i dont have enough reputation for comment.Thanks again
Barbaros Alp