What is Hybrid dictionary

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What is Hybrid dictionary..

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HashTable class should be used when the collection is large
for performance reasons similarly for small collections
ListDictionary class is used.HybridDictionary Class is a mix
of both the worlds.HybridDictionary Class implements
IDictionary by using a ListDictionary while the collection
is small, and then switching to a Hashtable when the
collection gets large.

[SerializableAttribute]
public class HybridDictionary : IDictionary,
ICollection, IEnumerable
This class is recommended for cases where the number of
elements in a dictionary is unknown.
The constructor accepts a Boolean parameter that allows the
user to specify whether the collection ignores the case when
comparing strings. If the collection is case-sensitive, it
uses the key's implementations of Object..::.GetHashCode and
Object..::.Equals. If the collection is case-insensitive, it
performs a simple ordinal case-insensitive comparison, which
obeys the casing rules of the invariant culture only. By
default, the collection is case-sensitive

A key cannot be nullNothingnullptra null reference (Nothing
in Visual Basic), but a value can