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    Welcome to Stack Overflow! While this code snippet may solve the question, including an explanation really helps to improve the quality of your post. Remember that you are answering the question for readers in the future, and those people might not know the reasons for your code suggestion. Please also try not to crowd your code with explanatory comments, as this reduces the readability of both the code and the explanations! Commented Aug 1, 2016 at 8:58
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    The function ConvertIntoIntList doesn't exits. Commented Jun 12, 2018 at 10:59
  • Also, you need to add the following class: static public class HelperMethods { static public List<int> ConvertIntoIntList(this string[] stringList) { int x = 0; var intList = stringList.Where(str => int.TryParse(str, out x)) .Select(str => x) .ToList(); return intList; } } Commented Jun 15, 2018 at 6:24