You can find many solutions in C # for Euler projects . This is one resource: http://archive.msdn.microsoft.com/projecteuler
Also tests for Computer language. In tests of the game there are solutions in C # (mono). They encourage people to make faster decisions, and looking at them you can find good recommendations for tuning performance.
Finally, if you are switching from another programming language and want to compare ways to solve common problems, sites such as Rosetta Code or langref . They are also well versed in how to do common things in a new language or as a reference (or even as preparation for general interview questions).
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