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  1. using System;
  2.  
  3. public class Test
  4. {
  5. public static void Main()
  6. {
  7. // your code goes here
  8. string a = null;
  9. string b = null;
  10.  
  11. var result = string.Format("{0}/{1}", a, b);
  12.  
  13. Console.WriteLine(result);
  14. Console.WriteLine(result == null);
  15. }
  16. }
Success #stdin #stdout 0s 29664KB
stdin
Standard input is empty
stdout
/
False