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C# | Check if Hashtable has a fixed size

Last Updated : 11 Jul, 2025
Hashtable.IsFixedSize Property is used to get a value which indicates whether the Hashtable has a fixed size or not. Syntax: 
public virtual bool IsFixedSize { get; }
Return Value: This property returns true if the Hashtable has a fixed size otherwise it returns false. The default is false. Below programs illustrate the above-discussed property: Example 1:
Output: 
False
Example 2:
Output: 
False
Note:
  • A collection with a fixed size does not allow the addition or removal of elements after the collection is created, but it allows the modification of existing elements.
  • A collection with a fixed size is simply a collection with a wrapper that prevents adding and removing elements. Therefore, if changes are made to the underlying collection, including the addition or removal of elements, the fixed-size collection reflects those changes.
  • Retrieving the value of this property is an O(1) operation.
Reference:
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