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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
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I ran your code in visual studio.net 2015. I input null string and there is an error. Is there anything I missed running your code correctly in my computer? I'm just a newbie in C#.
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Your code is readable. But I suggest to use guards for null string value.