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Using LINQ or the old-fashioned approach, how can I get all permutations of a word/number (without using an external API)?
Eg ab = ab, ba,
abc = acb, bac, etc
Is this a specific computer science problem like image recognition, etc?
There is a fantastic MSDN article on this very subject that should help you get started. This is a very well-studied computer science problem. For additional reference, see fascicles of The Art of Computer Programming Volume 4. In particular, check out Pre-fascicle 2B which exactly covers the problem of generating all permutations.