Invalid cast, C# - rextester

Invalid cast

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Compilation time: 0,14 sec, absolute running time: 0,08 sec, cpu time: 0,09 sec, average memory usage: 12 Mb, average nr of threads: 3

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Error(s):

Exception in user code:

System.InvalidCastException: Specified cast is not valid.
   at Rextester.Program.Main(String[] args)