How to Serialize collection

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I have class with property of type ISet. I want to serialize that class but don't know how to do with ISet.

[Serializable]    
class Question: ISerializable
{
  private int id;
  public int Id
  {
    get{return id;}
    set{id = value;}
  }

  private ISet answerChoice;
  public ISet AnswerChoices
  {
   get{return answerChoices;}
   set { answerChoices = value; }
  }

  public Question(SerializationInfo info, StreamingContext context)
  {
       id = info.GetInt32("id");
       answerChoices = //how to deserialize this collection
  }

  void ISerializable.GetObjectData(SerializationInfo info, StreamingContext context)
  {
       info.AddValue("id", id);
       info.AddValue("ac", answerChoices);
  }
}

Do anyone try to make the same? Please, help me.

1

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How about:

info.GetValue("ac",...);

And why do you implement you own serialization if you do not add any additional value?