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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 s1=null;
  9. 		string s2=string.Empty;
  10.  
  11. 		Console.WriteLine(s2.Trim());
  12. 		Console.WriteLine(s2.Trim().Length);
  13.  
  14. //	Console.WriteLine(s1.Trim());
  15. //	Console.WriteLine(Convert.ToString(s1).Trim());
  16. 	}
  17. }
Runtime error #stdin #stdout #stderr 0.04s 26856KB
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stdin
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Standard input is empty
stdout
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Standard output is empty
stderr
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Unhandled Exception:
System.NullReferenceException: Object reference not set to an instance of an object
  at Test.Main () [0x00000] in <filename unknown>:0 
[ERROR] FATAL UNHANDLED EXCEPTION: System.NullReferenceException: Object reference not set to an instance of an object
  at Test.Main () [0x00000] in <filename unknown>:0
https://ideone.com/SmkCZo
language:
C# (gmcs 5.20.1)
created:
8 years ago
visibility:
public

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