Try HashSet:
The HashSet(Of T) class provides high-performance set operations. A set is a collection that contains no duplicate elements, and whose elements are in no particular order…
The capacity of a HashSet(Of T) object is the number of elements that the object can hold. A HashSet(Of T) object’s capacity automatically increases as elements are added to the object.
The HashSet(Of T) class is based on the model of mathematical sets and provides high-performance set operations similar to accessing the keys of the Dictionary(Of TKey, TValue) or Hashtable collections. In simple terms, the HashSet(Of T) class can be thought of as a Dictionary(Of TKey, TValue) collection without values.
A HashSet(Of T) collection is not sorted and cannot contain duplicate elements…
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