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isNumber extension method for string in C#

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isNumber string extension method for testing strings.

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  1. public static class StringExtensions
  2.     {
  3.         public static bool isNumber(this String str)
  4.         {
  5.             double temp;
  6.             return double.TryParse(str, out temp);
  7.         }
  8.     }

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