ArrayList Implements the interface using an array whose size is dynamically increased as required.To browse the .NET Framework source code for this type, see the Reference Source.

 CaseInsensitiveComparer Compares two objects for equivalence, ignoring the case of strings.

 Comparer Compares two objects for equivalence, where string comparisons are case-sensitive.

 Hashtable Represents a collection of key/value pairs that are organized based on the hash code of the key.To browse the .NET Framework source code for this type, see the Reference Source.

 Queue Represents a first-in, first-out collection of objects.

 SortedList Represents a collection of key/value pairs that are sorted by the keys and are accessible by key and by index.

 Stack Represents a simple last-in-first-out (LIFO) non-generic collection of objects.

 CollectionBase Provides the abstract base class for a strongly typed collection.

 DictionaryBase Provides the abstract base class for a strongly typed collection of key/value pairs.

 ReadOnlyCollectionBase Provides the abstract base class for a strongly typed non-generic read-only collection.