[Solved] System.InvalidOperationException in my c# project

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Don’t remove elements while iterating over the collection with a foreach.

Also, I’d recommend using List<T> rather than ArrayList.

An easier way to solve the task at hand is to simply do:

public static void Remove(List<Account> L, int accnb) => 
                            L.RemoveAll(obj => obj.AccN == accnb);

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solved System.InvalidOperationException in my c# project