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  1.  
  2. using System;
  3. using System.Collections;
  4. namespace CollectionsApplication
  5. {
  6. class Program
  7.     {
  8.         static void Main(string[] args)
  9.         {
  10.             ArrayList arr = new ArrayList();
  11.             arr.Add(1);
  12.             arr.Add(10);
  13.             arr.Add('A');
  14.             arr.Add(1);
  15.             int sum = 0;
  16.             foreach (int i in arr)
  17.             {
  18.  
  19.                 sum = sum + i;
  20.                 arr.Remove('A');
  21.             }
  22.             Console.WriteLine(sum);
  23.             Console.ReadLine();
  24.         }
  25.     }
  26. }
Runtime error #stdin #stdout #stderr 0s 134400KB
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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.InvalidOperationException: Collection was modified; enumeration operation may not execute.
  at System.Collections.ArrayList+ArrayListEnumeratorSimple.MoveNext () [0x00020] in <8f2c484307284b51944a1a13a14c0266>:0 
  at CollectionsApplication.Program.Main (System.String[] args) [0x00067] in <e34b0f48b6f74222b320597b0adc7e2f>:0 
[ERROR] FATAL UNHANDLED EXCEPTION: System.InvalidOperationException: Collection was modified; enumeration operation may not execute.
  at System.Collections.ArrayList+ArrayListEnumeratorSimple.MoveNext () [0x00020] in <8f2c484307284b51944a1a13a14c0266>:0 
  at CollectionsApplication.Program.Main (System.String[] args) [0x00067] in <e34b0f48b6f74222b320597b0adc7e2f>:0
https://ideone.com/HTWL3i
language:
C# (gmcs 5.20.1)
created:
6 years ago
visibility:
public

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