Hi
I know that in .Net Dictionary is serializable and I found my own work around in order to solve this issue in my application but I'm very curious for knowing the reason for it.
Does anyone know the reason why Dictionary is serializable ?
Thanks
Amir

because SerializableAttribute is applied
 

[SerializableAttribute]
[ComVisibleAttribute(false)]
public class Dictionary<TKey, TValue> : IDictionary<TKey, TValue>, 
    ICollection<KeyValuePair<TKey, TValue>>, IEnumerable<KeyValuePair<TKey, TValue>>, 
    IDictionary, ICollection, IEnumerable, ISerializable, IDeserializationCallback

a .NET class called KeyedCollection. KeyedCollection derives from the iList interface instead of iDictionary, and is therefore serializable.
So if you need a keyed list and your objects include unique values, you can use KeyedCollection and get the benefits of serialization as well.

You also can check it out:
1.http://www.c-sharpcorner.com/Blogs/BlogDetail.aspx?BlogId=362