score:3
Accepted answer
This should get you the idea:
new [] {
"010000100001", "010000100001", "010000100001", "010000100002",
"010000100002", "010000100002", "010000200003", "010000200003",
"020000300004", "020000300005" }
.GroupBy(s => new {
Subject = s.Substring(0,2),
Chapter = s.Substring(2,6),
Book = s.Substring(8) });
Edit See a demo live on https://ideone.com/A6RQU
Source: stackoverflow.com
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