What exception type should be thrown when trying to add duplicate items to a collection? [closed]

Question

Following code should throw exception to prevent adding duplicate collection item.

ICollection<T> collection = new List<T>();  public void Add(T item) {     if (collection.Contain(item))     {           throw new SomeExceptionType()     }      collection.Add(item); } 

What standard exception type is the most appropriate?

Answer 1

Well, Dictionary<,>.Add() throws ArgumentException if such key already exists, so I guess this could be a precedent.

Answer 2

Linq uses two more exceptions DuplicateNameException and DuplicateKeyException you can use these if you are using system.data assembly.