[liuxia] Fix issue found by Wang Tao. #1, #2, #3
[liuxia] Fix issue reported by Chen Bojian #4
[liuxia] Add progress (medium level) project on LINQ skills. Add first test on where clause.
[liuxia] Refine LINQ test. Add LINQ test for Select operator.
Merge pull request #1 from lxconan/master

merge fix