/// <summary>
/// Saves document to collection using specified key.
/// If document with such key already exists, it will be silently overwritten.
/// </summary>
public bool Save(String key, Object document)
{
if (key == null)
{
throw new ArgumentNullException("key");
}
if (document == null)
{
throw new ArgumentNullException("document");
}
_metadata.SetDocumentId(document, key);
_collection.Save(_documentType, document);
return(true);
}